JP2007132080A - Rolling pressure wheel heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling pressure wheel heating device obtaining a sufficient heating value and allowing rolling pressure wheels to maintain a predetermined temperature range during rolling compaction work. <P>SOLUTION: Rolling pressure rollers 1A, 1B compacting an asphalt mixture laid and leveled by an asphalt finisher, have heating means 4A, 4B heating a fluid; jetting means Na, Nb jetting the fluid heated by the heating means 4A, 4B, to the surfaces of the rolling pressure wheels 2 of the rolling pressure rollers 1A, 1B; non-contact temperature measuring means 5 measuring the surface temperature of the rolling pressure wheels 2 of the rolling pressure rollers; and a control means 6 receiving signals from the non-contact temperature measuring means 5 to control the heating means 4A, 4B. The control means 6 has a function of not operating the heating means 4A, 4B when the surface temperature of the rolling pressure wheels 2 measured by the non-contact temperature measuring means 5 is a first set value or more, but operating the heating means 4A, 4B when the surface temperature is not more than a second set value lower than the first set value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling wheel heating device for a vehicle having a rolling wheel for compacting a spread asphalt mixture in asphalt pavement construction.

  In asphalt pavement, the rolling operation of the pavement after the asphalt mixture is spread is an important process that affects the quality of the pavement. The density of the asphalt mixture when it is spread by the asphalt finisher, which is a leveling machine for asphalt mixture, is about 70 to 90% of the final required density. The spread asphalt mixture is finished to a predetermined density by compacting with a so-called rolling roller such as an iron wheel roller, a tire roller, or a vibration roller.

  When compacting a pavement with a compaction roller, water is generally applied to the compaction wheel to prevent asphalt from adhering to the compaction wheel surface of the compaction roller. As a result, the pavement becomes less flexible, and a sufficient compacting effect cannot be obtained, making it impossible to ensure quality.

  In order to roll the pavement so that a good compaction effect can be obtained, it is necessary to start rolling at a temperature as high as possible. However, if the temperature difference between the pavement and the rolling wheel is large, for example, water spray Even if applied, asphalt may be attached to the surface of the rolling wheel. In that case, in general, an anti-adhesive agent is mixed with water to prevent adhesion, but since the anti-adhesion agent is very expensive and eventually water is used, the temperature drop of the pavement does not occur. Inevitable.

  On the other hand, it is known that asphalt is difficult to adhere to the rolling wheel if the temperature difference between the paving body and the rolling roller of the rolling roller is small, so water cannot be used or water usage must be suppressed as much as possible. In the case of a special pavement material, a method of increasing the temperature of the compaction wheel itself by directly heating the compaction wheel with a burner or the like to prevent asphalt adhesion (see, for example, Patent Document 1) is also employed. .

However, the conventional method for preventing asphalt from adhering to the rolling wheel of the rolling roller has the following problems.
(A) When sprinkling water on the rolling wheel, it is necessary to procure water on site.
(B) When water is used, the temperature of the pavement decreases. In particular, a decrease in temperature due to watering in winter does not provide a predetermined degree of compaction, which adversely affects quality.
(C) When water is sprayed on the roller compaction wheel, it becomes an impediment to the temperature rise of the compaction wheel.
(D) In the case of a paving material having a property that must be laid at a high temperature, water may not be effective in preventing adhesion.
(E) In the case of paving materials with properties that must be laid at a high temperature, an anti-adhesive agent may be mixed with water, but the anti-adhesive agent is expensive, The complication arises that the mixing ratio must be managed appropriately.
(F) The method of directly heating the compaction wheel with a burner is difficult to control appropriately, and may cause damage to the compaction wheel, particularly a rubber tire, due to overheating.
JP 2002-115207 A

  Accordingly, an object of the present invention is to provide a rolling-wheel heating device in which a sufficient amount of heat is obtained and the rolling-wheel is maintained within a predetermined temperature range without performing complicated temperature adjustments during the rolling operation. There is.

  According to the present invention, in the compaction rollers 1A and 1B for compacting the asphalt mixture spread by the asphalt finisher, the heating means 4A and 4B for heating the fluid, and the fluid heated by the heating means 4A and 4B Injecting means Na, Nb for injecting onto the surface of the pressure roller 2 of the pressure roller 1A, 1B, non-contact temperature measuring means 5 for measuring the temperature of the surface of the pressure wheel 2 of the pressure roller, and the non-contact temperature It has a control means (control unit) 6 for receiving the signal from the measuring means 5 and controlling the heating means 4A, 4B, and the control means 6 is the surface of the rolling wheel 2 measured by the non-contact temperature measuring means 5. The heating means 4A, 4B are deactivated when the temperature of the gas exceeds the first set value, and the heating means 4A, 4B is activated when the temperature becomes equal to or lower than the second set value lower than the first set value. Let It has a function.

  In the practice of the present invention, air and / or water can be used as the fluid. Therefore, the heating means 4A includes a fuel supply system (for example, the propane gas cylinder 10 and the gas pipe 11), a fuel cutoff valve (electromagnetic cutoff valve 45), a burner 44, and a blower system (blower 42). The fuel supplied from the propane gas cylinder 10 and the gas pipe 11) burns in the burner 44, the air sent from the blower system (blower 42) is heated by the combustion gas, and the heated hot air is injected from the injection means Na. It has come to be.

  Alternatively, the heating means 4B includes a fuel supply system (for example, propane gas cylinder 10 and gas pipe 11), a fuel cutoff valve (electromagnetic cutoff valve 45), a burner 44, and a heat exchanger (for example, a serpentine type heat exchanger) through which water flows. 42B), the fuel supplied from the fuel supply system (propane gas cylinder 10 and gas pipe 11) burns in the burner 44, and the water flowing through the heat exchanger 42B is heated by the combustion gas, and the heated Hot water is jetted from the jetting means Nb.

  In the type in which the heating means heats water, it is preferable that the water tank is mounted on the rolling roller 1B.

  According to the above-mentioned present invention, the water spray to the rolling wheel at the time of the compaction work of the pavement after leveling the asphalt composite material is greatly reduced, and the amount of water for spraying used on site is reduced.

  Or, as the asphalt composite material is leveled, watering to the rolling wheel is not required during the rolling operation of the pavement, so there is no decrease in the road surface temperature due to watering, and a sufficient compaction degree can be obtained and the quality is good. Kept.

  Since the temperature of the rolling wheel is measured by a non-contact type temperature sensor, the temperature of the hot air and / or hot water injected to the rolling wheel can be adjusted to an appropriate value, and as a result, the surface of the pressure wheel Can be maintained at the optimum temperature.

  Even in the case of a paving material having a property that must be laid at a high temperature, the temperature of hot air and / or hot water sprayed onto the rolling wheel can be adjusted to an appropriate value.

  Since the rolling wheel is not directly heated by the burner, there is no fear of damage even if the rolling wheel is a rubber tire.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, a first embodiment will be described with reference to FIGS.
1 and 2, the rolling roller 1A includes three rolling wheels 2 as front wheels and four rolling wheels 2 as rear wheels.

  A heating device mounting pipe 3 composed of a square pipe having a square cross section is supported by the yoke 31 in front of the front wheel and behind the rear wheel.

  The heating device mounting pipe 3 has two heating devices 4A attached to the front side of the vehicle in the case of the front wheels and to the rear side of the vehicle in the case of the rear wheels. In addition, one or more hot air nozzles Na are provided on the vertical surface of the heating device mounting pipe 3 on the side of the rolling wheel 2 so that the hot air nozzle Na faces the rolling wheel 2.

  In the illustrated example, a propane gas cylinder 10 is placed on the rear upper part of the rolling roller 1A, and the propane gas cylinder 10 and a heating device 4A described later are connected by a gas pipe 11.

  An operation panel 13 shown in detail in FIG. 3 is installed in the vicinity of the driver seat 12 of the rolling roller 1A, and in the vicinity of the front and rear rolling wheels 2, there is a non-use for measuring the surface temperature of the rolling wheel 2. A contact temperature sensor 5 is attached. The non-contact temperature sensor 5 and the operation panel 13 are connected by an input signal line Li. Note that the number of non-contact temperature sensors 5 attached may be the same as the number of the compaction wheels 2 or may be provided only on the representative compaction wheels.

  Next, the configuration of the operation panel 13 will be described with reference to FIG.

  In order from the upper center of the operation panel 13 to the lower side, a display unit 131 for displaying the temperature of the compaction wheel, a fire extinguishing temperature display unit 132, a fire extinguishing temperature setting button 133, an ignition temperature display unit 134, an ignition temperature setting button 135, a manual operation An automatic changeover switch 136 is arranged, a fire extinguishing button 137 is arranged on the right side of the extinguishing temperature setting button 133 in the figure, and an ignition button 138 is arranged on the right side of the ignition temperature setting button 135 in the figure.

  Each operation of the fire extinguishing button 137 and the ignition button 138 is configured to be effective only when the manual / automatic changeover switch 136 is switched to the manual mode.

  In the case of automatic, if the pavement material selection switch (not shown) is pressed, the fire extinguishing set temperature and the ignition set temperature are stored in advance in a database (not shown) for each pavement material. It is configured so that the ignition and extinguishing temperatures of the wheel heating device 4A are set.

In manual operation, ignition is performed with the ignition button 138, and heating is continued unless the fire extinguishing button 137 is pressed. This mode is used for adjusting and maintaining the heating device.
In addition, automatically, when there is no data on fire extinguishing and ignition in the database, such as when the pavement material is different from the normal material, the extinguishing temperature setting button 133 is arbitrarily operated to set the extinguishing temperature, or the ignition temperature setting The ignition temperature is set by operating the button 135, and the extinguishing / ignition is automatically performed when reaching the extinguishing temperature or the ignition temperature at which the extinguishing and ignition operations are set.

  Next, the configuration of the rolling wheel heating device 4A will be described with reference to FIG.

  The rolling wheel heating device 4A has the combustion case 41A on the vertical surface 3r on the opposite side of the heating device mounting pipe 3 from the rolling wheel, as described above. In the combustion case 41A, for example, a flange portion 41Af is formed so that one surface of a rectangular parallelepiped box-shaped body is missing and spreads outward of the rectangular parallelepiped on the missing surface side. The flange portion 41Af is attached to the vertical surface 3r on the side opposite to the rolling wheel of the heating device attachment pipe 3.

  On the other hand, the heating device attachment pipe 3 is a vertical surface 3r opposite to the rolling wheel, and a portion corresponding to the open surface of the rolling wheel heating device 4A is notched so that the combustion gas is blown out and injected from the hot air nozzle Na. It is configured to be.

  On the upper surface 41h of the combustion case 41A, a discharge port 42o of a blower 42 having a blower motor 42m is attached so as to penetrate the upper surface 41h, and an ignition part 43a of the spark plug 43 is attached so as to penetrate the upper surface 41h.

  A gas burner 44 is attached to the vertical surface 41v of the combustion case 41A opposite to the rolling wheel 2 so that the tip of the gas burner 44 penetrates the vertical surface 41v. An electromagnetic cutoff valve 45 is connected to the gas burner 44 through a joint 46, and the electromagnetic cutoff valve 45 communicates with the propane gas cylinder (see reference numeral 10 in FIG. 1) through the gas pipe 11.

  The spark plug 43 is connected to the battery 8 by a power line Le via a power switch 7 that also serves as a booster. The power switch 7 is connected to a control unit 6 as a control means by a control signal line Lo1.

  The control unit 6 is connected to the non-contact sensor 5 through an input signal line Li, and is connected to the electromagnetic shut-off valve 45 and the blower motor 42m through control signal lines Lo2 and Lo3.

Next, a method for controlling the rolling wheel heating device will be described with reference to FIG.
First, the electromagnetic shut-off valve 45 is opened (step S1). Then, propane gas as fuel is injected from the nozzle of the gas burner 44. Therefore, by operating the power switch 7, the spark plug 43 is energized to ignite propane gas (step S2).

  Thereafter, when the blower motor 42m is energized (step S3), the blower rotates and air is forcibly sent into the combustion case 41A, and propane gas burns vigorously.

  Next, the temperature of the surface of the compaction wheel 1 is measured based on the information from the non-contact temperature sensor 5 (step S4).

  The control unit 6 determines whether or not the surface temperature of the roller wheel 2 has reached the set fire extinguishing temperature (first set temperature) (step S5), and the surface temperature of the roller wheel 2 becomes the set fire extinguishing temperature. If it has reached (YES in step S5), the process proceeds to step S6. On the other hand, if the surface temperature of the rolling wheel 2 has not reached the set fire extinguishing temperature (NO in step S5), the process returns to step S4 and repeats step S4 and subsequent steps.

  In step S6, the control unit 6 turns off the power switch 7, stops energization of the blower motor 42m, closes the electromagnetic shut-off valve 45, and stops air blowing to extinguish the gas burner 44 (step S7).

  In addition, the electromagnetic shut-off valve 45 is replaced with a flow control valve capable of adjusting the flow rate. In step S6, the flow rate of the flow control valve is reduced, the blower 42 is stopped, and the fire is simply dropped, that is, it is in a ignited state. It is also possible to leave.

In step S8, the surface temperature of the compaction wheel 2 is measured, and it is determined whether or not the surface temperature of the compaction wheel 2 has become equal to or lower than the set ignition temperature (second set temperature). If it becomes (YES of step S9), it will return to step S1 and will repeat step S1 and after.
On the other hand, if the temperature is not lower than the set ignition temperature (NO in step S9), the process returns to step S8 to repeat the loop of steps S8 and S9.

1st Embodiment of FIGS. 1-5 demonstrated above is a system in which the rolling-wheel heating apparatus 4A utilizes warm air.
On the other hand, 2nd Embodiment of FIGS. 6-8 is made into the system in which the rolling-wheel heating apparatus 4B utilizes warm water. Hereinafter, the second embodiment will be described with reference to FIGS.

  6 and 7, the pressure roller 1B includes three pressure wheels 2 as front wheels and four pressure wheels 2 as rear wheels.

  A pipe-shaped nozzle forming tube 30 is supported by a yoke 32 in the width direction of the vehicle in front of the front wheels and behind the rear wheels. One or more hot water nozzles Nb are formed for each rolling wheel on the side of the nozzle forming tube 30 facing the rolling wheel 2.

  The placement of the propane gas cylinder 10, the operation panel 13 in the vicinity of the driver's seat, and the attachment of the non-contact temperature sensor 5 are generally the same as those in the first embodiment, and the description thereof is omitted.

  Next, the configuration of the rolling wheel heating device 4B will be described with reference to FIG.

  The rolling-wheel heating device 4B is attached to the vicinity of the propane cylinder 10 by a support member (not shown) at the upper rear of the vehicle (rolling roller) 1B (see FIG. 6).

  The rolling-wheel heating device 4B includes a cylindrical heating cylinder 41B, a serpentine heat exchanger 42B accommodated in the heating cylinder 41B, water pipes 46 connected to the front and rear of the serpentine heat exchanger 42B, The water pipe 46 has a pump 47 interposed upstream of the serpentine heat exchanger 42B, and a hot water nozzle Nb with the opening facing the side of the compaction wheel 2 at the tip of the water pipe.

  Further, the rolling wheel heating device 4B includes an ignition plug 43 installed on the upstream side of the flame inlet 41Bi of the heating cylinder 41B, a gas burner 44 attached by a bracket 44B on the further upstream side of the ignition plug 43, And an electromagnetic shut-off valve 45 connected to the gas burner 44. The electromagnetic shut-off valve 45 is connected to the propane cylinder 10 and the gas pipe 11.

  The spark plug 43 is connected to the battery 8 by the power line Le via the power switch 7 that also serves as a booster. The power switch 7 is connected to a control unit 6 as a control means by a control signal line Lo1.

  The control unit 6 is connected to the non-contact sensor 5 via the input signal line Li, is connected to the electromagnetic shut-off valve 45 via the control signal line Lo2, and is connected to the pump 47 via the control signal line Lo3.

  The control method of the rolling-wheel heating device 4B is generally the same as the control method of the rolling-wheel heating device 4B of the first embodiment described above, and the subsequent description is omitted.

According to the embodiment of the present invention having the above-described configuration, the hot air type rolling-wheel heating device 4A according to the first embodiment does not use water, and the rolling operation of the pavement after asphalt mixture laying is performed. Since the water spray to the rolling wheel at the time is greatly reduced, the amount of water for watering used on site is reduced.
Moreover, in the hot water type rolling-wheel heating device 4B of 2nd Embodiment, although the water tank is mounted in the rolling-roller roller (vehicle) 1B, the quantity of the water for watering used on the spot decreases.

  Since the amount of water used during the rolling operation of the pavement after leveling the asphalt mixture is significantly reduced, there is no decrease in road surface temperature, a sufficient degree of compaction is obtained, and the quality is kept good.

  Since the temperature of the rolling wheel 2 is measured by the non-contact temperature sensor 5, the temperature of the hot air and / or hot water injected to the rolling wheel 2 can be adjusted to an appropriate value, and as a result, The surface temperature of the pressure wheel 2 can be maintained at an optimum temperature.

  Even in the case of a paving material having a property that must be laid at a high temperature, the temperature of hot air and / or hot water sprayed onto the rolling wheel 2 can be freely adjusted.

  Since the rolling wheel 2 is not directly heated by the gas burner 44, there is no fear of damage even if the rolling wheel is a rubber tire.

  The illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention. In the illustrated example, the fuel supplied from the fuel supply system of the heating means is propane gas. Or liquid fuel such as light oil. Alternatively, an electric heater can be used as the heating means.

1 is a side view of a rolling roller equipped with a first embodiment of a rolling wheel heating device of the present invention. FIG. 2 is a rear view corresponding to FIG. The front view of the control board concerning embodiment of the rolling-wheel heating apparatus of this invention. The block diagram of 1st Embodiment of the rolling-wheel heating apparatus concerning this invention. The flowchart which showed the control method of the rolling-wheel heating apparatus of this invention. The side view of the compaction roller carrying 2nd Embodiment of the compaction wheel heating apparatus of this invention. FIG. 3 is a rear view corresponding to FIG. 2. The block diagram of 2nd Embodiment of the rolling-wheel heating apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B ... Rolling roller 2 ... Rolling wheel 3 ... Heating device attachment pipe 4A, 4B ... Rolling wheel heating device 5 ... Non-contact temperature sensor 6 ... Control unit 7 ... Power switch 8 ... Battery 41A ... Combustion case 41B ... Heating cylinder 42 ... Blower 42B ... Self-tube heat exchanger 43 ... Spark plug 44 ... Gas burner 45- ..Electromagnetic shut-off valve 46 ... Water piping 47 ... Water pump

Claims (3)

  In a rolling roller for compacting an asphalt mixture spread by an asphalt finisher, a heating unit that heats the fluid, and a spray unit that sprays the fluid heated by the heating unit onto the rolling wheel surface of the rolling roller, Non-contact temperature measuring means for measuring the temperature of the surface of the rolling wheel of the pressure roller, and control means for controlling the heating means in response to a signal from the non-contact temperature measuring means, When the temperature of the surface of the compaction wheel measured by the non-contact temperature measuring means becomes equal to or higher than the first set value, the heating means is deactivated, and the second set value is lower than the first set value. A rolling wheel heating device having a function of operating the heating means when it becomes.   The fluid is air, and the heating means includes a fuel supply system, a fuel shut-off valve, a burner, and a blower system. The fuel supplied from the fuel supply system burns in the burner and is sent from the blower system by the combustion gas. 2. The rolling-wheel heating device according to claim 1, wherein air to be heated is heated, and the heated hot air is jetted from the jetting means.   The fluid is water, and the heating means has a fuel supply system, a fuel shut-off valve, a burner, and a heat exchanger through which water flows, and the fuel supplied from the fuel supply system burns in the burner, and the combustion The rolling wheel heating device according to claim 1, wherein water flowing through the heat exchanger is heated by gas, and the heated hot water is jetted from the jetting means.

Images