Paving adhesive melting furnace stirring device

Abstract

To provide a melting furnace stirring device and a melting method capable of melting a pavement adhesive material used for pavement of a road at a proper temperature and holding it at the proper temperature.SOLUTION: The melting furnace stirring device 1 includes a heat-resistant container 2, a heating means 3, and a stirring means 4. The stirring means 4 is arranged so as to be inclined from the upper surface of the heat-resistant container 2 toward the bottom part. The method for melting the pavement adhesive includes a step of charging the pavement adhesive into a heat-resistant container, a step of heating the pavement adhesive by a heating means, a step of stirring the pavement adhesive in the heat-resistant container by a stirring means, and a step of stopping heating when the pavement adhesive reaches a use temperature and continuing stirring for a predetermined time.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a melting kiln stirring device, and more particularly to a melting kiln stirring device used to heat and melt paving adhesives provided in a solid state. [Background technology]

[0002] Roads that require a certain level of strength, such as highways and bridges, are formed by laying an asphalt pavement layer on top of a concrete deck. However, if the asphalt pavement layer is placed directly on top of the concrete deck, rainwater and melted snow containing snow-melting agents will penetrate and come into contact with the deck, which may cause deterioration of the deck over time. In order to prevent deterioration of the concrete deck, it is effective to place a waterproof layer on top of the deck.

[0003] Conventionally, urethane-based waterproofing materials and urea-based waterproofing materials have been known as waterproofing layer materials for concrete deck slabs. However, if an asphalt pavement layer is placed directly on a waterproofing layer made of a urethane-based or urea-based waterproofing material, the adhesion between the waterproofing layer and the asphalt pavement layer is poor, and the asphalt pavement layer may peel off. Therefore, in recent years, a treatment has been widely used in which an additional pavement adhesive is applied between the waterproofing layer and the asphalt pavement layer to improve the adhesion between the waterproofing layer and the asphalt pavement layer.

[0004] Patent Document 1 discloses a deck waterproofing structure in which a waterproof layer, a paving adhesive layer, and an asphalt paving layer are layered in that order on a deck, and in which an asphalt-based adhesive or a hot melt resin-based adhesive is applied to the paving adhesive layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-37808 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] In recent years, asphalt-based adhesives, which have high adhesive properties with asphalt pavement layers, have been widely used as pavement adhesive layers. Asphalt-based adhesives are solid at room temperature, they must be heated to melt and liquefy before use and then applied. However, as the temperature rises, the viscosity drops rapidly as they melt, and if the temperature rises above a certain level, the material's physical properties will be destroyed. Furthermore, the required film thickness cannot be secured, raising concerns about a decline in quality. For this reason, application work must be carried out under appropriate temperature control.

[0007] The present invention has been made in consideration of the above-mentioned problems, and the problem to be solved is to provide a dissolving device and a dissolving method that can dissolve paving adhesive used for road paving at an appropriate temperature and maintain that temperature. [Means for solving the problem]

[0008] The melting kiln stirring device for paving adhesive of the present invention is characterized by comprising a heat-resistant container, a heating means arranged at the bottom of the heat-resistant container, and a stirring means arranged at an angle from the top surface of the heat-resistant container toward the bottom.

[0009] In the melting kiln stirring device for paving adhesive of the present invention, the stirring means is preferably a screw with spiral blades formed on the rotating shaft, and the stirring means is preferably inclined toward the bottom of the heat-resistant container at an angle of 35 degrees or more and 55 degrees or less relative to the top surface.

[0010] The melting furnace stirring device for paving adhesive of the present invention preferably further comprises two or more temperature measuring means for measuring temperatures at different height positions inside the heat-resistant container.

[0011] The present invention also provides a method for dissolving paving adhesive, comprising the steps of: placing paving adhesive in a heat-resistant container; heating the paving adhesive with a heating means; stirring the paving adhesive in the heat-resistant container with a stirring means; and stopping heating with a thermostat when the paving adhesive reaches a usable temperature and continuing stirring for a predetermined period of time. [Effects of the Invention]

[0012] The melting furnace stirring device for paving adhesive of the present invention has a heating means disposed at the bottom of the heat-resistant vessel. By heating the paving adhesive, which is initially supplied in a solid state, from the bottom, the temperature of the entire paving adhesive can be raised quickly and uniformly.

[0013] The melting kiln stirring device for paving adhesive of the present invention, in particular, stirs with a screw that is inclined toward the bottom of the heat-resistant container at an angle of 35 degrees or more and 55 degrees or less relative to the top surface, thereby efficiently stirring the entire inside of the heat-resistant container and making the temperature of the paving adhesive uniform.

[0014] The melting furnace stirring device for paving adhesive of the present invention measures the temperature at different height positions inside a heat-resistant container, thereby accurately determining the temperature of the paving adhesive and preventing the destruction of the material's physical properties. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a top view of the melting furnace stirring device of the present invention. [Figure 2] 2 is a cross-sectional view of the melting furnace stirring device shown in FIG. 1 along the line AA. [Figure 3] 2 is a cross-sectional view of the melting furnace stirring device of FIG. 1 BB. [Figure 4] 1 is a flowchart of the dissolution method of the present invention. [Figure 5] FIG. 1 is a diagram showing the relationship between the temperature and viscosity of a paving adhesive using the melting kiln stirring device of the present invention. [Figure 6] FIG. 10 is a diagram showing the difference in temperature change of the paving adhesive when the agitation means is operating and when it is not operating. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Configuration of melting furnace stirring device]

[0017] A preferred embodiment of the melting furnace stirring apparatus of the present invention will now be described with reference to the drawings. Fig. 1 shows a top view of the melting furnace stirring apparatus 1. Fig. 2 shows an AA cross-sectional view of the melting furnace stirring apparatus 1 shown in Fig. 1, and Fig. 3 shows a BB cross-sectional view of the melting furnace stirring apparatus 1 shown in Fig. 1. The melting furnace stirring apparatus 1 of this embodiment comprises a heat-resistant container 2, a heating means 3 arranged at the bottom of the heat-resistant container 2, and a stirring means 4 arranged at an angle from the top of the heat-resistant container 2 toward the bottom.

[0018] The heat-resistant container 2 of this embodiment is preferably made of metal. The heat-resistant container 2 is a container with an approximately rectangular parallelepiped appearance. An opening 2a with an openable lid is provided on the top surface of the heat-resistant container 2, allowing the paving adhesive to be poured in. The lid is not shown in the drawings. A discharge outlet 2b is provided on the lower side of the heat-resistant container 2, allowing the melted material to be removed.

[0019] The stirring means 4 in this embodiment is a screw with a spiral blade 4a formed on its rotation shaft. The stirring means 4 is inclined toward the bottom at a 45-degree angle relative to the top surface of the heat-resistant container 2. The screw, which is the stirring means 4, can rotate forward and backward using power from a motor (not shown), and the rotation speed is also variable. The most suitable angle for the stirring means 4 in this embodiment is 45 degrees relative to the top surface, but equivalent stirring performance can be obtained even if the stirring means 4 is inclined toward the bottom of the heat-resistant container at an angle of 35 to 55 degrees relative to the top surface.

[0020] A heating means 3 is disposed at the bottom of the heat-resistant container 2. The heating means 3 of this embodiment includes a heat source 3a and a metal pipe communicating with the heat source 3a. In this embodiment, the two metal pipes are disposed on both sides of the stirring means 4 along the long sides of the bottom of the heat-resistant container 2.

[0021] Temperature measuring means are inserted into the heat-resistant container 2. Two temperature measuring means 5a and 5b are shown in Figures 1 and 3, but additional temperature measuring means may be placed at different heights within the heat-resistant container 2 to measure the temperature and use it to control the heating means 3, thereby enabling more accurate melting of the paving adhesive.

[0022] [Pavement adhesive suitable for melting kiln stirring devices]

[0023] The characteristics of paving adhesives that are particularly suitable for melting in the melting kiln stirring device of this embodiment will be explained using Figure 5. It is essential that paving adhesives do not melt even when the road surface becomes hot, so adhesives with a melting point of 60°C or higher are used. Furthermore, generally, applying the adhesive at a temperature of 150°C or higher increases the adhesive strength with the waterproof layer.

[0024] On the other hand, the viscosity of paving adhesives drops rapidly when heated after melting. If stored for a long time at temperatures above 250°C, the material's physical properties will be destroyed and adhesive strength will be lost. For this reason, it is preferable to melt typical paving adhesives at a target temperature of 200-220°C.

[0025] The physical properties of three types of paving adhesives that can be suitably dissolved by the melting kiln agitation device of this embodiment are shown in Table 1. The viscosity (mm 2 The test method is based on the "Viscosity Test Method Using a Double Cylinder Rotational Viscometer" described in the "Pavement Survey and Test Method Handbook A052." The test equipment used was a B-type viscometer DV2T (manufactured by Eiko Seiki Co., Ltd.). [Table 1]

[0026] Here, paving adhesive A is Asplus Coat M (Sika Japan Co., Ltd.), paving adhesive B is Asplus Coat M (R1) (Sika Japan Co., Ltd.), and paving adhesive C is HQ Coat AU (Nichireki Co., Ltd.).

[0027] As shown in Table 1, the viscosity of any paving adhesive drops rapidly when the temperature exceeds 220°C. If paving adhesive is applied when its viscosity is lower than the specified value, it may not be possible to ensure the appropriate film thickness. As a result, paving adhesive that is not applied at the correct temperature may cause a deterioration in the quality of the entire paved road. For this reason, temperature control is important when using any paving adhesive.

[0028] The relationship between temperature and viscosity of three types of paving adhesives is shown in a graph in Figure 5. As a comparative example, the relationship between temperature and viscosity of a polymer-modified type II asphalt for paving ("Polyphalt SS" by Nichireki Corporation) is also shown in a graph.

[0029] As shown in Figure 5, paving adhesives have the property that their viscosity drops rapidly when heated after melting, and that the temperature suitable for application is significantly higher than that of asphalt.

[0030] As shown here, the melting furnace agitator of this embodiment is a device for melting a mixture of 160°C and 10,000mm kinetic viscosity. 2 / s, while the kinematic viscosity at a temperature of 280°C is approximately 200mm 2 The structure is particularly suitable for heating, stirring and dissolving materials that drop to temperatures below 1000 / s.

[0031] [How to dissolve paving adhesive]

[0032] An embodiment of the method for dissolving paving adhesive of this embodiment is shown in Figure 4. The method for dissolving paving adhesive of this embodiment includes a material charging step (S1) of charging paving adhesive into a heat-resistant container 2, a heating step (S2) of heating the paving adhesive with heating means 3, and a stirring and temperature maintaining step (S3) of stirring the paving adhesive in the heat-resistant container 2 with stirring means 4.

[0033] Two or more of these steps can be carried out simultaneously, or any of the steps can be repeated or the order of the steps can be changed. [Example]

[0034] An example of a method for dissolving paving adhesive using the dissolving kiln stirring device 1 of this embodiment is shown below. The following example is illustrative and is not intended to limit the present invention.

[0035] The heat-resistant vessel 2 of the melting furnace agitator 1 of this embodiment is a metal vessel having a substantially rectangular parallelepiped shape with a length of 1600 mm, a width of 1300 mm, and a depth of 900 mm.

[0036] The heat source 3a of the heating means 3 of the melting furnace stirring device 1 is a boiler. Two metal pipes are connected to the boiler 3a. The metal pipes are located on both sides of the stirring means 4, along the long sides of the bottom of the heat-resistant container 2. The inside of the heat-resistant container 2 is heated by circulating hot air from the boiler 3a through the metal pipes.

[0037] The stirring means 4 of the melting furnace stirring device 1 is a screw with a 73 mm high blade 4a formed on a central shaft with a diameter of 52.7 mm. The blade 4a is formed in a spiral shape, making four revolutions within a range of approximately 750 mm from the tip of the central shaft of the stirring means. The central shaft of the stirring means 4 is rotatably fixed toward the bottom of the heat-resistant vessel 2 at a 45-degree angle to the top surface of the heat-resistant vessel 2, and can rotate with a torque of 200 to 400 Nm. The stirring means 4 normally rotates in the forward direction, creating a rotational flow that causes the paving adhesive in the heat-resistant vessel 2 to rise from the bottom, mixing and stirring the material and uniformizing the temperature.

[0038] The tip of the agitator 4 reaches a position approximately 155 mm above the bottom of the heat-resistant container 2. The distance between the agitator 4 and the metal pipes of the heating means 3, which are arranged on both sides of the agitator 4, is approximately 30 mm. The paving adhesive poured into the heat-resistant container 2 reaches the bottom of the heat-resistant container and accumulates, and is heated from the point where it comes into contact with the heating means 3. However, because the agitator 4 is close to the bottom of the heat-resistant container 2 and the heating means 3, localized overheating can be prevented by rotating the agitator 4.

[0039] In this embodiment, the temperature measurement means 5a and 5b are placed at a position 520 mm from the top surface of the heat-resistant container 2. In addition, a surface thermometer that measures the temperature of the top surface of the paving adhesive is added as an additional temperature measurement means.

[0040] By applying a control means that inputs the measurement results of at least one of the temperature measurement means 5a, 5b, it is possible to control the amount of heat from the heating means 3. Alternatively, a thermostat can be mounted on the heating means 3, and a temperature detection unit of the thermostat can be disposed adjacent to the temperature measurement means, thereby controlling the amount of heat from the heating means 3.

[0041] A method for melting paving adhesive using the melting kiln agitator 1 of this embodiment will be described. In the material charging step (S1) of this embodiment, paving adhesive is charged through the opening 2a of the heat-resistant container 2. Although not required, the boiler of the heating means 3 can be ignited in the material charging step to preheat the inside of the heat-resistant container 2. For preheating in the material charging step, it is preferable to raise the temperature of the heating means 3 to the lowest temperature that can be set.

[0042] When the material charging step (S1) is completed by charging a predetermined amount of material, the heating step (S2) is started. In the heating step, the paving adhesive is heated by the heating means 3.

[0043] When the temperature measuring means 5a, 5b confirm that the paving adhesive has reached a predetermined temperature, the heating step (S2) ends and the mixing and temperature maintenance step (S3) begins. In the mixing and temperature maintenance step (S3), while continuing mixing by the mixing means 4, when the temperature of the paving adhesive falls below the set temperature, the heating means 3 is ignited and the temperature is maintained.

[0044] The dissolving method of this example was carried out at a set temperature of 200°C, which is the temperature at which paving adhesives are used, and the results are shown in Table 2 below. [Table 2]

[0045] The melting kiln stirring device 1, which applied the melting method of this example, was able to uniformly melt the paving adhesive in about three hours. By appropriately stopping and starting the stirring means 4 when the temperature of the paving adhesive rose, it was possible to maintain good quality of the paving adhesive and prevent the physical properties of the material from being destroyed.

[0046] To confirm the effect of the stirring means 4, the temperature distribution of the paving adhesive in the heat-resistant container 2 was measured when the stirring means 4 of the melting kiln stirring device 1 was operated at the timing shown in Table 2 and when it was not operated at all. To confirm the temperature of the paving adhesive in more detail, in addition to the temperature measurement means 5a and 5b, thermometers were placed at five positions at different heights from the top surface of the heat-resistant container 2 to measure the temperature. The temperature measured by the temperature measurement means 5a is the temperature shown as No. 1 in Figure 6.

[0047] The difference in temperature distribution of the paving adhesive with and without the agitation means 4 in operation is shown in Figure 6. The temperature distribution shown in Figure 6 (A) shows the temperature change in the paving adhesive when the agitation means 4 is not in operation. The temperature distribution shown in Figure 6 (B) shows the change over time in the paving adhesive when the agitation means 4 is in operation. It is clear from these results that by operating the agitation means 4, the paving adhesive is mixed uniformly and the entire material is maintained at a desirable temperature.

[0048] While specific examples of the present invention have been described in detail above based on the embodiments, these are merely examples and do not limit the scope of the claims. The claimed technology includes various modifications and variations of the specific examples exemplified above. The dimensions and arrangement of the components of the melting furnace stirring device 1, the shape of the stirring means, the arrangement of the temperature measuring means, etc. can be freely changed as long as the original functions are not impaired. Furthermore, the melting method can perform multiple processes simultaneously or repeat a process multiple times. [Explanation of symbols]

[0049] 1 Melting furnace stirring device 2 heat-resistant containers 2a opening 2b Outlet 3 Heating methods 4 mixing methods 5a, 5b Temperature measurement methods

Claims

1. A heat-resistant container, a heating means disposed at the bottom of the heat-resistant container; a stirring means disposed at an angle from the top surface of the heat-resistant container toward the bottom; A melting kiln stirring device for paving adhesives equipped with a

2. the stirring means is a screw having a spiral blade formed on a rotating shaft, 2. The melting furnace stirring device according to claim 1, wherein the stirring means is inclined toward the bottom of the heat-resistant vessel at an angle of 35 degrees to 55 degrees relative to the top surface.

3. 2. The melting furnace stirring device according to claim 1, further comprising two or more temperature measuring means for measuring temperatures at different height positions inside the heat-resistant vessel.

4. 1. A method for dissolving paving adhesive, comprising: depositing paving adhesive into a heat-resistant container; heating the paving adhesive with a heating means; agitating the paving adhesive in the heat-resistant container with an agitation means; stopping heating when the paving adhesive reaches a use temperature and continuing to mix for a predetermined period of time; A dissolution method comprising:

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