JPS629366Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an infrared heating device used for repairing asphalt paved roads, etc.

<Prior Art> When asphalt pavement is repaired, the repaired surface is usually heated and softened using a heating device and then regenerated and repaired. This heat treatment is performed by heating the asphalt pavement at approximately 500°C, for example, in order to prevent the deterioration of asphalt mixed in the asphalt pavement as a binder for the pavement body, and is required for regeneration and repair of the asphalt pavement to a predetermined repair depth. It was necessary to raise the temperature to 120-140℃.

Since the thermal penetration of asphalt pavement has properties such as a constant thermal gradient, if the heating temperature of the asphalt pavement surface is determined, the asphalt pavement can be heated and softened to a predetermined repair depth. For example, it is necessary to maintain the ambient temperature of the asphalt pavement at approximately 500°C and the temperature of the asphalt pavement surface at approximately 180°C.

As such conventional heating means, the asphalt pavement surface is directly heated using a burner, but this locally heats only the pavement surface and tends to cause deterioration of the asphalt and the charcoal phenomenon.

Therefore, the present applicant proposed in Utility Application No. 151767-1987 a heating device that converts part of the burner heating energy into infrared rays with good heat penetration and heats and softens the road surface to a predetermined depth using this infrared rays. There is.

By the way, according to the infrared absorption spectrum series of asphalt shown in Figure 1, asphalt has low thermal transmittance for infrared rays with a short wavelength of about 2 to 3 microns and long wavelength infrared rays of about 6 to 8 microns, and asphalt absorbs these infrared rays and generates heat. It has the characteristics of

However, in the conventional infrared heating device, asphalt pavement is heated and softened using only short wavelength infrared rays of about 2 to 3 microns, so the long wavelength infrared rays cannot be used effectively, leading to energy loss. In addition, it took a long time to heat to the repair temperature to a predetermined depth.

<Summary of the invention> The present invention was devised in view of these conventional problems. By installing a device in a heating device and irradiating the asphalt pavement surface with both infrared rays in the short wavelength region and long wavelength region, in which asphalt has good heat absorption properties, in addition to short wavelength infrared rays, it is possible to This system uses infrared rays with good long wavelengths to quickly raise the temperature of asphalt pavement to a predetermined depth to a predetermined depth, and improves energy efficiency.

Hereinafter, the present invention will be explained based on an embodiment shown in FIGS. 2 and 3.

In FIG. 2, the tip of an air supply pipe 2 for supplying combustion air into the box-like main body 1 is connected to an opening formed in the center of the upper wall of the box-like main body 1 whose bottom surface is open. A blower (not shown) that pumps combustion air is connected to the base end side of the air supply pipe 2. A fuel supply pipe 3 is provided passing through the air supply pipe 2, and a nozzle 4 attached to the tip of this pipe 3 faces inside the box-shaped main body 1. Further, the tip of a spark plug (not shown) is exposed near the tip of the nozzle 4. Here, the air supply pipe 2, the fuel supply pipe 3, the nozzle 4, and the spark plug constitute a burner.

Further, inside the box-shaped main body 1, a first infrared ray generating plate 5 made of porous or mesh special steel is provided, having a predetermined distance from the nozzle 4 and surrounding the nozzle 4. Since the first infrared generating plate 5 has poor heat resistance, a generating member 6 made of sintered heat-resistant ceramic is provided at a portion of the first infrared generating plate 5 which is exposed to the high temperature flame of the nozzle 4. Here, when the generator plate 5 is heated to about 1000-1400°C, preferably 1200-1300°C, it generates infrared rays having a wavelength of about 2-3μ.

Further, inside the box-shaped main body 1, a porous heat radiating plate 7 for completely burning the passing combustion gas is provided with a predetermined distance from the generating plate 5 and covering the generating plate 5. Further, inside the box-shaped body 1, a second infrared ray generating plate 8 on which special ceramic is vapor-deposited (sprayed) is provided with a predetermined distance from the heat sink plate 7 and to cover the heat sink plate 7. There is. The temperature of this infrared generating plate 8 is approximately 400°C to 700°C, preferably 500 to 600°C.
When heated, it emits infrared rays with a wavelength of about 6 to 8 microns. 9 is a heat insulating member that covers the inner wall of the box-shaped main body 1.

Here, the burner and the first infrared generating plate 5 constitute a first infrared generating device, and the burner and the second infrared generating plate 8 constitute a second infrared generating device.

The box-shaped main body 1 is suspended on a vehicle (not shown) at a predetermined distance from the asphalt pavement 10, and the burner is operated from a control panel in the driver's cab of the vehicle.

Next, the operation of this heating device will be explained.

Flame is ejected from the nozzle 4 toward the generating member 6 by burning the fuel in the burner. At this time, the temperature of the tip of the flame is about 1300°C, and the temperature of the first infrared generating plate 5 and the generating member 6 is about 1000 to 1400°C.
heated to ℃. Therefore, the first infrared generating plate 5 generates infrared rays with particularly strong radiant energy in a short wavelength region of approximately 2 to 3 microns.

Furthermore, when the combustion gas that has passed through the first infrared generating plate 5 passes through the heat radiating plate 7, its temperature is lowered to approximately 800° C. by the heat radiating plate 7, and then flows toward the second infrared generating plate 8. This gas flow heats the second infrared ray generating plate 8 to about 400 to 700°C, so it generates infrared rays with particularly strong radiant energy in the wavelength range of about 6 to 8μ, but due to the action of the vapor-deposited ceramic, The long wavelength region is increased.

Therefore, the infrared rays generated from both the infrared generating plates 5 and 8 are combined, and regions where the radiant energy of the combined infrared rays is strong exist in the wavelength regions of 2 to 3 microns and 6 to 8 microns. Therefore, when the asphalt pavement 10 is irradiated with infrared rays in these wavelength ranges, the asphalt pavement absorbs the infrared rays in those wavelengths and generates heat.

Furthermore, since the temperature of the combustion gas that has passed through the infrared ray generating plate 8 is lowered to 400 to 500°C, the asphalt pavement surface onto which the combustion gas flow is injected is heated by the combustion gas without deterioration.

As a result, the emitted combustion gas can soften the shallow layer by simultaneously heating and generating heat in the deep layer using infrared rays, so the asphalt pavement can be heated in a shorter time than before, and the combustion energy of the burner can be reduced. Can be used effectively.

In this embodiment, the infrared rays generating plates 5 and 8 are heated with a single burner to generate infrared rays, but the infrared rays generating plates 5 and 8 may be heated with separate burners, for example. Good <Effect of the invention> As explained above, the invention heats the asphalt pavement using short and long wavelength infrared rays in the area of asphalt with good heat absorption. The asphalt pavement can be heated to a predetermined depth, and the heating time can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a graph showing an absorption spectrum series of asphalt, and FIG. 2 is a sectional view of a main part showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Box-shaped main body, 4... Nozzle, 5... First infrared generating plate, 8... Second infrared generating plate, 10
...Asphalt pavement.

Claims (1)

[Scope of utility model registration request] A heating device for heating asphalt pavement includes a first infrared generating device that generates infrared rays in a short wavelength range where asphalt has good heat absorption properties, and a second infrared ray generator that generates infrared rays in a long wavelength range where asphalt has good heat absorption properties. An infrared heating device for paved roads, etc., comprising an infrared generator.