Road Painting Machine

Abstract

To provide a road surface coating machine capable of suitably applying a two-pack type polyurea coating for coating by adjusting the coating temperature.SOLUTION: A road surface coating machine comprises: a heating unit for respectively heating a main agent and a curing agent that constitute a polyurea coating; a liquid pressurizing unit for respectively applying pressure to the main agent and the curing agent; a mixing unit for mixing the main agent and the curing agent pressurized by the liquid pressurizing unit; and an injection unit having an injection port for injecting toward a road surface the polyurea coating mixed in the mixing unit. The mixing unit is arranged near the injection port and provided inside the injection unit. Since the mixing unit is arranged in the vicinity of the injection port and provided inside the injection unit, the mixing unit is less likely to be affected by air temperature. Thus, a decrease in the temperature of the main agent and the curing agent introduced into the mixing unit can be suppressed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a road coating machine for forming line-shaped or other road markings by spraying a two-component polyurea paint onto a road surface. [Background technology]

[0002] Various types of paint, such as heat-melting paint, two-component curing paint, and water-based paint, have traditionally been used to form road markings such as lines, and many inventions and ideas have been disclosed regarding paint sprayers used for this purpose.

[0003] For example, Patent Document 1 discloses an idea for a sprayer for a two-component curing road marking material that applies the two-component curing road marking material to a road surface using two nozzles mounted on a vehicle or cart, and that is characterized in that the curing agent intermingles with the base agent at a height of approximately half the height from the road surface to be coated to the nozzle outlet of the base agent. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 61-143656 Summary of the Invention [Problem to be solved by the invention]

[0005] The applicator shown in Patent Document 1 solves the short curing time problem by mixing the main coating material and the curing agent of the two-component curing road marking material in the air above the road surface, rather than on the road surface. However, mixing the two components in the air is easily affected by air temperature, and is not suitable for paints that require temperature control during application.

[0006] The present invention provides a road surface sprayer that can suitably apply two-component polyurea paint by adjusting the temperature of the paint to about 55 to 75°C. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention has the following configuration. That is, the road coating machine according to the present invention is a road coating machine that sprays a two-component type polyurea paint onto a road surface, and includes a heating section that heats the base agent and hardener that constitute the polyurea paint, respectively, a liquid pressurizing section that pressurizes the base agent and hardener that constitute the polyurea paint, respectively, a mixing section that mixes the base agent and hardener pressurized by the liquid pressurizing section, and a spray section having a spray nozzle that sprays the polyurea paint mixed in the mixing section toward the road surface, and the mixing section is disposed near the spray nozzle and provided inside the spray section. The heating unit has a heating element that generates heat by electric power, and includes a first power generating unit that generates electric power to generate heat from the heating element, and a second power generating unit that generates electric power to operate the liquid pressurizing unit, the second power generating unit being provided separately from the first power generating unit that operates the heating unit, and the base agent and the curing agent that are heated by electric power from the first power generating unit and pressurized by electric power from the second power generating unit that is different from the first power generating unit are mixed in the mixing unit provided inside the injection unit and injected from the injection unit. It is set up like this. It is characterized by the following. The mixing unit includes a cover body that covers the periphery of the injection unit. The base agent and the curing agent heated by the electric power of the first power generating unit provided separately from the second power generating unit may be mixed inside the cover body and sprayed from the spray unit.

[0008] According to the road coating machine of the present invention, since it is equipped with a heating section that heats the base agent and the hardener that make up the polyurea paint, the base agent and the hardener can be heated to temperatures suitable for application. In addition, the system is equipped with a liquid pressure section which pressurizes the base agent and hardener that make up the polyurea paint, a mixing section which mixes the base agent and hardener pressurized by the liquid pressure section, and an injection section having a nozzle which sprays the polyurea paint mixed in the mixing section towards the road surface.The base agent and hardener can be mixed well within the mixing section by the pressure applied by the liquid pressure section, and can then be sprayed from the nozzle using this pressure. In addition, since the mixing section is disposed near the injection port and provided inside the injection port, the mixing section is less susceptible to the effects of air temperature, and a decrease in the temperature of the base agent and hardener introduced into the mixing section can be suppressed.

[0009] In addition, if the base agent and hardener heated in the heating section are arranged to reach the mixing section through different liquid transport pipe sections, and each liquid transport pipe section is arranged so as to be disposed around the inner tube section through an insulating section having a lower thermal conductivity than the inner tube section, the base agent and hardener passing through the inner tube section are less susceptible to the effects of air temperature, which is preferable.

[0010] In addition, the heating unit has a heating element that generates heat using electricity, and if it is equipped with a power generation unit that generates the electricity to generate heat from the heating element, this is preferable because it allows the heating unit to stably heat the base agent and curing agent.

[0011] Furthermore, it is preferable to provide a second power generating unit that generates electricity to operate the liquid pressurizing unit, and to provide the second power generating unit separately from the power generating unit that operates the heating unit, since this allows the heating of the base agent and the hardener by the heating unit to be carried out stably without being affected by the operation of the liquid pressurizing unit.

[0012] Furthermore, by providing a wheel, a drive unit for rotating the wheel, and a third power generation unit for generating electricity to operate the drive unit, and arranging the spray unit to move with the rotation of the wheel by the drive unit, painting work on the road surface can be carried out efficiently. Furthermore, if the third power generation unit is provided separately from the power generation unit that operates the heating unit, the heating of the base agent and the curing agent by the heating unit can be performed stably without being affected by the operation of the drive unit, which is preferable. Effect of the Invention

[0013] The road paint sprayer according to the present invention can effectively apply two-component polyurea paint, which is applied by adjusting the temperature of the paint. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing an outline of an embodiment of a road surface painter according to the present invention; [Diagram 2] 2 is a vertical cross-sectional view showing an outline of the structure of an ejection unit and each liquid transport tube unit in FIG. 1. [Diagram 3]FIG. 2 is a diagram showing a cover body of FIG. 1. [Figure 4] 10 is a side view showing the ejection part and the cover body attached to the support part. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The embodiment of the invention will be specifically described with reference to the drawings. In the drawings, reference numeral 1 denotes a road painter, and FIG. 1 is a diagram showing an outline of the road painter 1 as seen from the side. The road sprayer 1 shown in FIG. 1 is formed in the shape of a carriage equipped with drive wheels 16 that rotate by the power of a drive unit 17, and is equipped with a spray unit 3 that sprays two-component polyurethane paint onto the road surface.

[0016] The road paint sprayer 1 in FIG. 1 includes three power generating units 4 that generate electricity, specifically, a first power generating unit 41, a second power generating unit 42, and a third power generating unit 43. Each power generation unit 4 is a generator that generates electricity using gasoline, diesel, natural gas, etc. as fuel, and the first power generation unit 41, the second power generation unit 42, and the third power generation unit 43 are all generators that generate electricity using the power of a gasoline engine.

[0017] The drive unit 17 has a motor, and rotates the drive wheels 16 using electric power from the electrically connected third power generation unit 43. That is, the road surface painter 1 moves using the electric power generated by the third power generation unit 43 as a power source. Furthermore, the movement of the road painter 1 is controlled by the operator using the operating stick 18, and without explaining the specific configuration, it is possible to move the road painter 1 forward, backward, stop, change or adjust the direction of movement, etc., so that the operator can move the road painter 1 and perform painting work on the road surface.

[0018] The road paint sprayer 1 includes a storage tank 11 for storing paint. The storage tank 11 has two tanks, namely, a storage tank 11a for storing the base agent of the two-component type polyurethane paint, and a storage tank 11b for storing the hardener, and a heating unit 2 is disposed inside each of the storage tanks 11a and 11b. The two-component polyurea paint used for road markings has a viscosity suitable for mixing and painting the two components by setting the temperatures of the base agent and hardener at approximately 55 to 75°C, and each heating section 2 is designed to heat the base agent and hardener to the appropriate viscosity.

[0019] Each heating portion 2 has a heating element that generates heat when electricity is passed through it, and specifically, is formed of a so-called immersion heater. Each heating unit 2 is electrically connected to the first power generating unit 41, and heats the base agent and the curing agent in each storage tank 11a, 11b with the electric power generated by the first power generating unit 41. In other words, each heating unit 2 can heat the base agent and the curing agent without being affected by the operating state of the third power generating unit 43, and can heat the base agent and the curing agent without being affected by the operating state of the second power generating unit 42 described later.

[0020] In addition, the road coating machine 1 is equipped with a temperature sensor that measures the temperature of the base agent and hardener in each of the storage tanks 11a, 11b, and a temperature control section (not shown) that has a control means that adjusts the amount of heating of the heating section 2 based on the measurement results of this temperature sensor, and adjusts the temperatures of the base agent and hardener in each of the storage tanks 11a, 11b to be within a range suitable for the painting work.

[0021] In addition, a mixing unit 5 for mixing the base agent and the hardener is disposed in each of the storage tanks 11a and 11b. The stirring unit 5 has a motor 50 that rotates by the electricity generated by the power generation unit 41, a shaft 51 that rotates by this motor 50, and a propeller-shaped stirring body 52 formed at the tip of the shaft 51, and is configured so that the respective liquids are stirred by rotating this stirring body 52 while it is submerged in the base agent and hardener, and the temperature of each liquid heated by each heating unit 2 is made uniform overall.

[0022] The base agent in each of the storage tanks 11a is provided so as to pass through a liquid pressurizing section 6a to reach the spray section 3, and the hardener in each of the storage tanks 11b is provided so as to pass through a liquid pressurizing section 6b to reach the spray section 3. The liquid pressurizing units 6a and 6b are so-called pumps, and specifically, are positive displacement pumps that discharge the base agent and the hardener at a predetermined pressure. The liquid pressurizing units 6a, 6b are operated by the force of a hydraulic unit (not shown) electrically connected to the second power generating unit 42. In other words, the liquid pressurizing units 6a, 6b can operate without being affected by the operating states of the first power generating unit 41 and the third power generating unit 43.

[0023] The base agent and hardener in each of the storage tanks 11a, 11b are sent to the spray unit 3 through the liquid feed pipe section 12. The liquid feed pipe section 12 includes a liquid feed pipe section 12a for sending the base agent and a liquid feed pipe section 12b for sending the hardener, the liquid feed pipe section 12a being disposed between the liquid pressurizing section 6a and the spray unit 3 to connect the two members, and the liquid feed pipe section 12b being disposed between the liquid pressurizing section 6b and the spray unit 3 to connect the two members. Each of the liquid transport pipes 12a, 12b is a flexible hose-like member, specifically, an insulated hose that is provided so that the temperature of the liquid flowing inside is not easily affected by the outside air temperature. Each of the liquid transport pipes 12a, 12b includes an inner tube 12c through which the liquid flows in the hollow inside portion, and an insulating part 12d having a lower thermal conductivity than the inner tube 12c. The insulating part 12d is formed in a cylindrical shape that covers the outside of the inner tube 12c, thereby reducing the heat transfer between the inside of the inner tube 12c and the outside air. In addition, each of the liquid transport pipes 12a, 12b suppresses the drop in temperature of the base agent and hardener flowing inside the inner cylinder portion 12c, 12d by suppressing heat transfer between the outside air and the inner cylinder portion 12c by the insulating portion 12d, but the drop in temperature of the base agent and hardener may be further suppressed by providing each of the liquid transport pipes 12a, 12b with an additional heating element capable of heating the base agent and hardener flowing inside the inner cylinder portion 12c.

[0024] The road surface coating machine 1 is equipped with a spraying unit 13 that sprays reflective material toward the road surface. The spraying unit 13 is equipped with a spraying port 13a that sprays small reflective material made of glass beads or the like, and a switching valve 13b that switches between supplying and stopping the reflective material to the spraying port 13a, and is configured so that the reflective material sprayed from the spraying port 13a is sprayed from the spraying unit 3 and sprayed onto the coating of the polyurethane paint applied to the road surface. That is, the spraying port 13a is disposed directly behind the spraying unit 3.

[0025] The reflective material sprayed from the spraying section 13 is stored in a storage tank 14 provided on the road surface painting machine 1, and is arranged to reach the spraying section 3 through a granule transport pipe section 14a that connects the lower part of the storage tank 14 to the spraying section 13. The storage tank 14 is connected to a pressurizing unit 7 consisting of an air compressor that increases the pressure of the air, and the air pressure in the sealed storage tank 14 is increased above the outside air pressure. By opening the switching valve 13b of the spraying unit 3, the pressurized air in the storage tank 14 is emitted outward from the spraying port 13a through the grain delivery pipe 14a, and the reflective material in the storage tank 14 is sprayed from the spraying port 13a by the air flow. 1 is configured to vigorously spray the reflective material from the spray port 13a by utilizing the air pressure in the storage tank 14 increased by the pressurizing unit 7, but the present invention is not limited to this, and the reflective material may be sprayed by utilizing a force other than air pressure without providing the pressurizing unit 7. Specifically, the reflective material may be sprayed by dropping it.

[0026] The spray section 3 of the road coating machine 1 shown in Figure 1 has an internal mixing section 32 for mixing the base agent and hardener, and is configured to spray the two-component polyurethane paint obtained by mixing the respective liquids in the mixing section 32 from the spray nozzle 31 onto the road surface. Fig. 2 is a vertical cross-sectional view showing the outline of the structure of the spray unit 3 and each of the liquid transport pipes 12a and 12b in Fig. 1. In Fig. 2, only the outline of the flow path of the two-component polyurea paint is shown, and the illustration of the valve for stopping the spraying of the paint and the mechanism for discharging the paint remaining in the mixing unit 32 after the painting work is completed are omitted to simplify the drawing. The mixing section 32 is formed in a substantially tubular shape, with one end forming a contact section 32 a where the base agent and the hardener first come into contact with each other, and the other end forming the injection port 31 . The base agent and hardener supplied from the liquid transport pipes 12a and 12b pass through flow paths 33a and 33b formed in the injection unit 3, respectively, and join at the contact unit 32a. The base agent and hardener joined at the contact unit 32a are mixed in the mixing unit 32 and injected from the injection port 31. The mixing unit 32 is provided with a small size so that the contact unit 32a is disposed in the vicinity of the injection port 31, and is provided so that the base agent and hardener are well mixed by the pressure applied by each liquid pressurizing unit 6a and 6b.

[0027] The spray unit 3 shown in FIG. 2 is attached to a support unit 15 provided on the road surface sprayer 1 via a mounting bracket (not shown). The support part 15 is a rod-shaped body with a rectangular cross section that protrudes laterally from the road painter 1, and the support part 15 is attached to the spray part 3 and constitutes a part of the frame part 85 of the cover body 8 that is arranged so as to cover the spray part 3. As shown in FIG. 1, the cover body 8 is formed and arranged so as to cover the spray part 3 and also cover the spray part 13 located directly behind the spray part 3.

[0028] Fig. 3 is a diagram showing the cover body 8 in Fig. 1. In Fig. 3, the spray unit 3 and the spray unit 13 attached to the support unit 15 via mounting brackets are omitted to simplify the drawing. The cover body 8 is composed of a frame portion 85 that is connected to the support portion 15 and fixed to the road surface coating machine 1, and a plate-shaped member attached to the frame portion 85. The support part 15 has an end portion on the right side in the figure connected to the road sprayer 1 and constitutes a part of the frame part 85 .

[0029] The plate-like member constituting the cover body 8 includes a vertical plate portion 81, a front plate portion 82, and side plate portions 83, each of which is attached to the frame portion 85. The vertical plate portion 81 is formed in a rectangular flat plate shape, and is disposed in an inclined manner so as to extend from above the spray portion 13 to the front of the spray portion 3 .

[0030] The front plate portion 82 is formed in a rectangular flat plate shape, is provided so as to be connected to the lower end of the vertical plate portion 81, and is disposed in front of the spray portion 3. The front plate portion 82 is formed so that its lower end is disposed in the vicinity of the road surface to be painted.

[0031] The side plate portion 83 includes an upper plate 83a formed in a triangular flat plate shape, and a lower plate 83b formed in a rectangular flat plate shape. The upper plates 83a are provided in total two pieces, one on each side end of the vertical plate portion 81, so as to be connected to both side ends of the vertical plate portion 81. The lower plates 83b are arranged so as to be connected to the lower ends of the upper plates 83a, respectively, and the lower ends of the lower plates 83b are formed so as to be located in the vicinity of the road surface to be painted. Furthermore, in the side plate portion 83, the upper plate 83a, which is positioned close to the road surface paint sprayer 1, has an approximately triangular gap S at its upper part, and the liquid transport pipe portions 12a, 12 pass through the inside of this gap S and are connected to the spray portion 3.

[0032] FIG. 4 is a side view showing the ejection unit 3 and the cover body 8 attached to the support unit 15. As shown in FIG. In FIG. 4, the mounting fixture for mounting the spray unit 3 to the support unit 15, the liquid transport tubes 12a and 12b connected to the spray unit 3, the spray unit 13, etc. are not shown to simplify the drawing. 4, the cover body 8 is provided so that the side plate portion 83 is disposed on the side of the ejection part 3. Moreover, the cover body 8 is provided so that the vertical plate portion 81 and the front plate portion 82 are disposed in front of the ejection part 3.

[0033] As shown in Figure 4, the cover body 8 is positioned so that the lower plate 83b and the lower end of the front plate portion 82 are lower than the injection port 31 located at the lower end of the mixing section 32 of the injection section 3, and the upper end of the upper plate 83a and the vertical plate portion 81 are higher than the contact portion 32a located at the upper end of the mixing section 32. By disposing the cover body 8 on the outer side or outer front of the mixing section 32, it is possible to block and weaken the wind from the side that is blown directly to the part of the spray section 3 where the mixing section 32 is disposed. This is expected to have the effect of suppressing the temperature drop of the part around the mixing section 32 in the spray section 3 from being caused by the outside air. By suppressing the temperature drop near the mixing section 32, when the base agent and the hardener join at the contact section 32a and are mixed in the mixing section 32, the temperature drop of the paint due to the temperature of the mixing section 32 is prevented, and the paint can be sprayed well from the spray nozzle 31. In particular, in a situation where the painting work is resumed after a long interruption, the cover body 8 is expected to have the effect of suppressing the temperature drop around the mixing section 32.

[0034] The base agent and hardener in each of the storage tanks 11a, 11b are heated by the heating units 2 which generate heat by electricity generated by a first power generation unit 41, and are pressurized by the liquid pressurizing units 6a, 6b which operate by electricity generated by a second power generation unit 42 separate from the first power generation unit 41, and are then pumped to the spray unit 3. In other words, the heat generated by each of the heating units 2 is not affected by the operation of the liquid pressurizing units 6a, 6b, so the base agent and hardener can be stably heated. Furthermore, the drive unit 17 that rotates the drive wheel 16 is operated by electricity generated by a third power generation unit 43 that is separate from the first power generation unit 41 and the second power generation unit 42. Therefore, the heat generated by each heating unit 2 and each liquid pressurizing unit 6a, 6b are not affected by the movement of the road coating machine 1, and the heating and pressure-feeding of the base agent and hardener can be carried out stably.

[0035] The road painter 1 according to the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the present invention. For example, the road painter 1 is configured so that an operator can operate the operating stick 18 to move the machine and perform painting work on the road surface while walking, but this is not limited to this. The road painter 1 may also be provided with a seat for the operator to sit in, and the operator may board the road painter 1 to perform the above-mentioned work.

[0036] In addition, the cover body 8 has the vertical parts 81 disposed only on the outer lateral sides of the jetting section 3, but the present invention is not limited to this, and the vertical parts 81 may be disposed in front or rear in addition to the lateral sides. If the cover body 8 is formed so that the vertical parts 81 cover the periphery of the jetting section 3 in this way, the vertical parts 81 can effectively block wind blown directly against the jetting section 3, and the effect of suppressing the temperature drop around the mixing section 32 by the cover body 8 can be expected to be further improved.

[0037] In addition, although the first power generation unit 41, the second power generation unit 42, and the third power generation unit 43 are all mounted on the road surface painter 1, this is not limited to this, and some of the power generation units 4 may be mounted on another vehicle or cart so that the road surface painter 1 can be moved and painting work can be performed on the road surface by following this. [Explanation of symbols]

[0038] 1 Road surface painting machine 11 Reservoir 12 Liquid feed pipe section 13 Spreading section 14 Storage Tank 15 Support part 16 Drive wheels 17 Drive unit 18 Control stick 2 Heating section 3 Injection part 31 Nozzle 32 Mixing section 4. Power Generation Section 41 First Power Generation Division 42 Second Power Generation Division 43 Third Power Generation Division 5 Stirring section 50 Motor 51 Shaft body 52 Stirring body 6 Liquid pressure section 7 Pressurizing section 8 Cover body 81 Vertical plate section 82 Front plate part 83 Side plate part 85 Frame W wheels

Claims

1. A road coating machine that sprays a two-component polyurea paint onto a road surface, A heating unit for heating the base agent and the curing agent constituting the polyurea paint, A liquid pressurizing unit that pressurizes the base agent and the hardener that constitute the polyurea paint; a mixing section for mixing the base agent and the hardener pressurized by the liquid pressurizing section; A spray unit having a spray nozzle for spraying the polyurea paint mixed in the mixing unit toward a road surface, The mixing section is disposed in the vicinity of the injection port and is provided inside the injection section, the heating unit has a heating element that generates heat by electric power, and a first power generating unit that generates electric power to generate heat in the heating element; a second power generating unit that generates electricity to operate the liquid pressurizing unit, the second power generating unit being provided separately from the first power generating unit that operates the heating unit; A road coating machine characterized in that the base agent and the curing agent are heated by the electric power of the first power generation unit and pressurized by the electric power of the second power generation unit, which is separate from the first power generation unit, mixed in the mixing unit provided inside the spray unit, and sprayed from the spray unit.

2. A cover body that covers the periphery of the injection part having the mixing part on the inside, The road coating machine according to claim 1, characterized in that the base agent and the curing agent heated by the electric power of the first power generating unit provided separately from the second power generating unit are mixed inside the cover body and sprayed from the spray unit.

3. The base material and the curing agent heated in the heating section are respectively delivered to the mixing section through different liquid delivery pipes, The road surface coating machine according to claim 1 or 2, characterized in that each of the liquid transport pipe sections comprises an inner cylinder section and an insulating section having a lower thermal conductivity than the inner cylinder section, and the insulating section is arranged around the inner cylinder section.

4. a wheel; a drive unit for rotating the wheel; and a third power generating unit for generating electricity for operating the drive unit, the jet unit being disposed to move by the rotation of the wheel by the drive unit; 4. The road sprayer according to claim 1, wherein the third power generation unit is provided separately from the power generation unit that operates the heating unit.

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