JPH0342086Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a road surface heating device used for repair work of asphalt pavement.

[Prior art] Generally, when repairing an existing asphalt pavement, the pavement is first heated and softened and scraped up, then the scraped up paving material is spread evenly, and new asphalt mixture is laid on top of it. We will continue to install
Alternatively, a method may be adopted in which the scraped paving material and new composite material are kneaded and laid. Such repair work may be carried out using a single multifunctional asphalt paving vehicle that has all of the above functions, or by a combination of dedicated work vehicles that have each of the above functions individually or in combination. However, in both cases, heating and softening of the paved road surface is performed by a heating device.

Conventionally, this type of heating device has a plurality of box-shaped burners arranged in a horizontal and vertical plane in close contact with each other inside a rectangular frame provided on the vehicle body. Often used are systems in which fuel such as gas is burned in the burner and the road surface is heated by infrared rays.

[Problems to be Solved by the Invention] However, the conventional heating device described above has a problem in that it is difficult to maintain the exhaust gas associated with combustion in the burner in an appropriate state. In other words, if the displacement is too large, low-temperature outside air will be sucked in from the edge of the frame, reducing the heating ability of the heating device at the edge, resulting in a drop in road surface temperature.
Furthermore, if the displacement is too small, the flames at the edges will blow out to the outside of the frame, heating roadside trees and other facilities, or causing flames. Another idea is to provide an exhaust duct in the center of the frame, but this poses a problem in that thermal efficiency decreases if hot air escapes directly from the exhaust duct.

[Means for Solving the Problems] In order to solve the above-mentioned problems, this invention provides a frame body facing the road surface and forming a plane with the road surface on the traveling vehicle body, and A plurality of box-shaped burners are arranged closely together inside, and an exhaust duct that opens vertically is installed in the center of the frame with its lower end protruding from the lower surface of the burner. A chimney is attached to the upper end of the chimney, projecting upwards.

[Function] In such a road surface heating device, an exhaust duct is provided to protrude from the lower surface of the burner,
The flame generated by the burner stays under the burner and once descends to transfer heat to the road surface, and then rises from the upper end of the exhaust duct at a predetermined height. As a result, the hot air discharged laterally from the lower peripheral edge of the frame is minimized, the road surface is effectively heated, and the adverse effects of heat on roadside trees and the like are prevented.

[Example] Hereinafter, an example of the road surface heating device of this invention will be described with reference to the drawings.

1 to 5 show a first embodiment of this invention, in which reference numeral 1 denotes a traveling vehicle body consisting of a tractor, and a heating device A is provided at the rear of the vehicle body. That is, a first frame 3 is provided at the rear end of the vehicle body 1 and is rotated left and right by a swing cylinder 2, and a second frame 5 is mounted on the first frame 3 and is moved up and down by a vertical cylinder 4. The second frame 5 is provided with a pair of front and rear frames 6 having a structure that can be folded at the center thereof and supported so as to be rotatable up and down on the front part of the front frame 6. There is. On the upper part of the second frame 5, the central part of the pair of front and rear frames 6 is pulled up and the front and rear frames 6 are bent at the hinge part 6a, so that the angle of the frame 6 can be adjusted or the frame can be adjusted. A winch 7 is provided to move the frame 6 to the storage position, and wheels 6b are provided at the rear end of the frame 6. and,
In the frame 6, a plurality of box-shaped burners 8 are arranged in close contact with each other in the vertical and horizontal directions. This burner 8 is
It consists of an upper cover 8a and a net-shaped heated body 8b below it.

These frames 6 include a rectangular outer frame 10 and an outer frame 1.
It consists of a horizontal frame 11 and a plurality of vertical frames 12 installed at the center in the longitudinal direction of 0, and an exhaust duct 13 for exhaust is provided in the center. The burner 8 is placed vertically with its edges placed on the horizontal frame 11 and the vertical frame 12.
Rows, arranged in many rows horizontally, with the front row rising towards the back,
The back row is sloping backwards, forming an inverted V-shape with a high center. The exhaust duct 13 is provided so as to protrude so that its lower end 13a is below the lower surface of the heated body 8b of the burner 8. A pair of ignition flame diffusers 14 are fixed to the left and right horizontal frames 11 of the exhaust duct 13 by bolts 15 that are screwed into nuts 15a fixed to the upper surfaces of the ignition flame diffusers 14. This ignition flame diffuser 14 is the third
As shown in the figures and FIG. 4, the ignition burner 16 is installed in the direction along the horizontal frame 11, and the ignition burner 16 to which the ignition plug 16a is attached is mounted on the upper part of the ignition flame diffuser 14. It is mounted with a gap between it and the body 14 to allow air to enter. This ignition burner 16 is connected to the support member 1 by a U bolt 16b.
7 to the horizontal frame 11, and a nozzle 18 is screwed onto the upper part of the horizontal frame 11.
A fuel hose 19 is connected to the upper part of the fuel tank, and an air intake port (not shown) is opened to the side thereof. The ignition flame diffuser 14 has an inner end 14a sealed, an outer end 14b that extends slightly inside the edge of the frame 6 and is open, and is provided with a cylindrical part 21 that opens upward in the center, and has a cylindrical part 21 on both sides. is formed with a slit 22 extending in the axial direction,
The flame generated by the ignition burner 16 is ejected from the slit 22 and the outer end 14b. A high-voltage current for ignition is supplied to the spark plug 16a through a conductor 23, and a device for operating the spark plug 16a is installed in the driver's seat S.

A chimney 30 is removably attached to the upper end 13b of the exhaust duct 13 and has a height from the road surface that is approximately equal to the height of the worker. This chimney 30 is located at the upper end 13 of the exhaust duct 13.
It is composed of a fitting part 31 that fits into b, a tapered part 32 that contracts upward from this fitting part 31, and an upper cylinder part 33, and a plurality of chimneys 30 with different inner diameters of the cylinder part 33 It is possible to prepare one and use one that matches the heating conditions as appropriate. This chimney 30 is removed when the first frame 3 and the second frame 5 are folded, such as during transportation, and is attached when the first frame 3 and the second frame 5 are in the planar shape shown in FIG. 2.

Furthermore, a cylinder storage device 25 that is moved up and down by a vertical cylinder 24 is attached to the front portion of the traveling vehicle body 1 via a pair of left and right parallel links 26 . In this storage device 25, a plurality of compartments (six in the figure) are formed inside a rectangular tank 27 with an open top and communicated with each other by partition plates, and water is stored in these compartments. LP gas cylinders 28 are housed in these compartments, and these cylinders 28 are connected to the burners 8 through supply pipes, hoses, valves, etc. (not shown), and LP gas is supplied to each burner 8. It is becoming more and more common. This water supplements the heat of vaporization of the LP gas consumed during combustion in the burner 8, and allows smooth vaporization in the cylinder 28. Further, in the event that the fire from the burner 8 spreads to surrounding trees and causes a fire, water from the water tank 25a is sucked up and used for extinguishing the fire.

In the road surface heating device configured as described above, ignition is performed quickly and easily. That is, the valve of the fuel gas supply pipe of the ignition burner 16 is opened, and a spark current flows through the ignition plug 16a to ignite the ignition burner 16. In the ignition flame diffuser 14, the slit 22 and the outer end 14b
The flame ejects from the slit 22 toward the lower surface of the burner 8 before and after the ignition flame diffuser 14, and the flame from the outer end 14b heads toward the lower surface of the burner 8 outside of the ignition flame diffuser 14, and the flame from the slit 22 heads toward the lower surface of the burner 8 on the outside. Heat 8b.
Therefore, when the valve of the pipe that supplies LP gas to burner 8 is opened, LP gas is ejected from burner 8,
It ignites upon contact with the flame from the ignition burner 16 or the red-hot heated object 8b. The flame in each burner 8 is injected onto the heated body 8b to heat the heated body 8b, and the road surface is heated and softened by the radiant heat from the heated body 8b. The exhaust gas from each burner 8 is retained in a space having an inverted V-shaped cross section formed by the slope of the burner 8, and sufficiently heats the road surface. A small part of the accumulated exhaust gas flows out from the edge of the frame 6, and most of the remaining part is sucked out of the exhaust duct 13 by the upward flow generated inside the chimney 30 and is sucked out of the chimney 30. It is discharged from a high position at the top. Therefore, even if workers are near the side of the heating device, they will not be exposed to the exhaust gas directly and will not experience eye fatigue or discomfort. There is no adverse effect of heat on roadside trees, etc. When the exhaust gas passing through the chimney 30 passes through the lower end 13a of the exhaust duct 13, it comes close to the road surface and transfers its heat to the road surface, further enhancing its heating effect. Moreover, the inner diameter of the cylindrical portion 33 of the chimney 30 is
The frame body 6 is selected in advance so that the flame does not blow out along with the exhaust gas flowing out from the edge of the frame 6, and the heating ability of the edge does not decrease due to outside air flowing in from the edge.

The inner diameter of the cylindrical portion 33 of the chimney 30 described above depends on conditions such as the required heating temperature of the road surface, the temperature of the road surface or the outside air, the amount of fuel gas blown, and the presence or absence of obstacles around the road surface. If the chimney 30 changes during operation, the chimney 30 can be replaced with one of a different inner diameter.

Figure 6 shows another embodiment of this invention, in which the chimney 3
A plate-shaped on-off valve 34 is installed in the cylindrical part 33 of the chimney 30 to make the effective opening area of the chimney 30 variable.
The on-off valve 34 is fixed to a shaft pin 35 that is pivotally supported on opposing side walls of the cylindrical portion 33. A handle 36 is fixed to the outer end of the shaft pin 35, and a pin 39 is inserted through a hole 37 formed in the center of the handle 36 and one of a plurality of locking holes 38 formed in the side wall of the cylindrical portion 33. The on-off valve 34 is fixed at a constant opening degree. In this example,
The opening area can be adjusted using the handle 36 of the on-off valve 3.
Since this can be done by simply rotating 4, it has the effect of making adjustment work easier during operation.

[Effects of the invention] As detailed above, this invention provides a frame body facing the road surface and forming a flat surface with respect to the road surface, and a plurality of burners on boxes are connected to each other inside the frame body. The exhaust ducts are arranged closely together and open vertically in the center of the frame body, with their lower ends protruding from the lower surface of the burner,
Furthermore, since the chimney is arranged so as to protrude above the exhaust duct, the exhaust gas can be discharged without reducing thermal efficiency, and the flame of the burner can be ejected to the outside without reducing the road surface heating ability. This provides an excellent effect in that the paving work can proceed smoothly without the risk of thermal effects on the surrounding area of the construction site.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a partially cutaway front view of Fig. 1, Fig. 3 is a view taken in the direction of the arrow in Fig. 1, and Fig. 4 is a view taken from Fig. 3. 5 is a view taken in the direction of the arrow in FIG. 1, and FIG. 6 is a sectional view showing another embodiment of this invention. 1... Traveling vehicle body, 6... Frame body, 8... Burner, 13...
Exhaust duct, 30...chimney.

Claims (1)

[Scope of utility model registration request] A frame body facing the road surface and forming a flat surface with respect to the road surface is provided on the traveling vehicle body, and inside the frame body, a plurality of box-shaped burners are arranged closely to each other, and a central portion of the frame body The road surface is characterized in that an exhaust duct that opens vertically is installed with its lower end protruding from the lower surface of the burner, and a chimney is connected to the upper end of the exhaust duct so as to protrude upward. heating device.