JP6171178B2 - Asphalt injection equipment - Google Patents

Description

  The present invention relates to an asphalt material injection device for discharging a molten asphalt material.

  Conventionally, as this type of asphalt material injection device, a melted asphalt material is accommodated in a melting pot, and a gear pump installed in the melting pot is operated to discharge the asphalt material in the melting pot to the outside. It is known (see, for example, Patent Document 1).

JP 2006-266000 A (paragraph [0010], FIG. 1 and FIG. 3)

  By the way, in the above-mentioned conventional asphalt material injection device, since the gear pump is installed in the melting pot, it is necessary to remove all the asphalt material in the melting pot in order to perform maintenance such as repair and replacement of the gear pump. However, since the molten asphalt material has high viscosity, it is difficult to remove the asphalt material from the melting pot, and as a result, there is a problem that maintenance of the gear pump is difficult.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an asphalt material injection device capable of easily performing maintenance of a gear pump.

In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a melting pot for containing an asphalt material, a first heating means for heating the melting pot, and the asphalt material in the melting pot are circulated to the outside. An asphalt injection device having a discharge pipe and a gear pump provided in the discharge pipe, wherein an external heating chamber arranged in parallel to the side of the melting pot, and a first heating the external heating chamber includes a second heating means, wherein the discharge pipe, said routed from dissolving tank so as to be exposed to the outside through the external heating chamber, said gear pump, located on the external heating chamber A heating device disposed below the melting pot for heating the melting pot, and a heated air guide for guiding heated air heated by the heating apparatus into the external heating chamber, The first heating means The heating device includes the heating device and the heated air guide, and the melting pot covers the pot body and the pot body from the side. A cylindrical case that forms an annular gap with the hook body, a lid that closes the upper part of the hook body and the cylindrical case, and the bottom and side of the hook body passing through the inside of the hook body A plurality of in-pile exhaust pipes that are open at a portion, and the cylindrical case is formed with a communication opening that allows the annular gap and the external heating chamber to communicate with each other. Is an asphalt material injecting device including the shuttle exhaust pipe, the annular gap, and the communication opening .

The invention of claim 2, projects upward from the ceiling portion of the external heating chamber, according to claim 1 having an exhaust protrusion having an exhaust port for discharging the heated air of the external heating chamber to the outside Asphalt material injection device.

According to a third aspect of the present invention, the exhaust projection has a cylindrical shape with a bottom at the top, and the exhaust port of the exhaust projection is opposed so as to face in a direction orthogonal to the axial direction of the exhaust projection. The asphalt material injecting device according to claim 2 , wherein the asphalt material injecting device is arranged.

According to a fourth aspect of the present invention, the melting pot is provided with an annular gap exhaust port for discharging the heated air in the annular gap to the outside, and the annular gap exhaust port is open downward. Item 4. The asphalt material injection device according to Item 2 or 3 .

According to a fifth aspect of the present invention, the plurality of hook internal exhaust pipes include an induction exhaust pipe having a side opening opened at a side portion of the melting pot facing the communication opening, Any one of the Claims 1 thru | or 4 provided with the shielding wall which interrupts | blocks between a side part opening and the said gear pump, and having the exhaust cover which diverts the flow of the said heating air exhausted from the said induction exhaust pipe along the said shielding wall. An asphalt material injection device according to claim 1.

According to a sixth aspect of the present invention, the plurality of hook exhaust pipes include an induction exhaust pipe having a side opening opened at a side portion of the hook body facing the external heating chamber, and the gear pump includes: The side opening of the induction exhaust pipe is disposed so as to face the communication opening, and is disposed at a position shifted to the side or the lower side of the communication opening as viewed from the gear pump side. a asphalt material injection apparatus according to any one of claims of claims 1 to 4 are covered with the shape casing.

The invention of claim 7 includes a drive motor, anda drive shaft directly coupled to the rotating output shaft of the drive motor, said gear pump gears of claims 1 to 6 is directly connected to the drive shaft An asphalt material injection device according to any one of the claims.

[Invention of Claim 1]
In the present invention, the discharge pipe for circulating the asphalt material in the melting pot to the outside is exposed to the outside through the external heating chamber arranged side by side of the melting pot, and the external heating chamber of the discharge pipe is The gear pump is provided in the part arrange | positioned. Thus, in the present invention, since the gear pump is provided outside the melting pot, the maintenance of the gear pump can be easily performed. Further, since the external heating chamber in which the gear pump is disposed is heated by the second heating means, it is possible to prevent the asphalt material in the discharge pipe from being cooled and difficult to flow, and to reduce the load on the gear pump. It becomes possible.

In addition , the heating device heats the melting pot, and the heated air heated by the heating device is guided into the external heating chamber by the heating ventilation guide, so that the external heating chamber is heated by the heating air. Thus, according to this invention, it becomes possible to utilize the heating apparatus for heating a melting pot for the heating of an external heating chamber.

In addition , it is possible to heat the pot body containing asphalt material from the side by passing through the annular gap formed between the pot body and the cylindrical wall on the way to the external heating chamber. Become. Thereby, effective utilization of heated air is achieved.

[Invention of claim 2 ]
According to the present invention, since the heated air in the external heating chamber is discharged to the outside by the exhaust protrusion, new heated air heated by the heating device is easily supplied to the external heating chamber, and The heated air can be replaced. Thereby, it becomes possible to suppress the temperature drop of the external heating chamber due to the stay of heated air. In addition, since the exhaust projection protrudes upward from the ceiling of the external heating chamber, the heated air is easily discharged and the replacement of the heated air is promoted.

[Invention of claim 3 ]
In the present invention, since the exhaust port of the exhaust projection is provided in a direction orthogonal to the axial direction of the exhaust projection, it is possible to prevent outside air from entering the external heating chamber from the exhaust port. In addition, since the exhaust ports are provided in pairs so as to face each other in a direction perpendicular to the axial direction of the exhaust projection, when the outside air passes through the pair of exhaust ports, It becomes easy to draw the heated air into the exhaust port, and the discharge of the heated air is promoted.

[Invention of claim 4 ]
In the present invention, since the annular gap exhaust port for discharging the heated air in the annular gap is provided, the retention of the heated air in the annular gap is suppressed. Moreover, since the annular clearance exhaust port is opened downward, the heated air in the annular clearance is less likely to be discharged than the heated air in the external heating chamber. Thus, according to the present invention, it is possible to easily introduce the heated air into the external heating chamber while suppressing the stay of the heated air in the annular gap.

[Invention of claim 5 ]
In the present invention, since it has a shut-off wall that blocks between the side opening of the induction exhaust pipe and the gear pump and has an exhaust cover that diverts the flow of heated air along the shut-off wall, it flows through the induction exhaust pipe. The heated air is deflected to the side by the shielding wall and then introduced into the external heating chamber. Thus, according to the present invention, since the heated air that has passed through the induction exhaust pipe can be prevented from being directly blown to the gear pump, the temperature of the gear pump can be prevented from excessively rising, and the trouble risk of the gear pump can be reduced. Is possible.

[Invention of claim 6 ]
In the present invention, the gear pump is disposed so as to face the communication opening, and the side opening of the induction exhaust pipe is disposed at a position shifted laterally or downward with respect to the communication opening as viewed from the gear pump side. Therefore, it is possible to suppress the heated air that has passed through the induction exhaust pipe from being directly blown to the gear pump, and it is possible to reduce the trouble of the gear pump due to an excessive temperature rise. Further, since the side opening of the induction exhaust pipe is covered with the cylindrical case, it becomes possible to guide the heated air that has passed through the induction exhaust pipe to the communication opening along the cylindrical case. It is possible to prevent the temperature of the liquid from becoming too low.

[Invention of Claim 7 ]
According to the present invention, the power transmission mechanism from the drive motor to the gear pump can be simplified, and the maintainability can be improved.

1 is a side view of an asphalt injection device according to a first embodiment of the present invention. Back view of asphalt injection equipment Top view of asphalt injection equipment Side sectional view showing the internal structure of the external heating chamber (A) Side view, (B) Side sectional view of the melting pot Cross section of melting pot and external heating chamber (A) Front sectional view of external heating chamber, (B) Perspective view of exhaust projection Side view of the melting pot according to the second embodiment Side sectional view of an annular clearance exhaust port according to another embodiment

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the asphalt material injection device 10 according to the present embodiment includes a melting pot 20 that stores the asphalt material, and a discharge pipe 15 that distributes the asphalt material in the melting pot 20 to the outside. When the gear pump 16 provided in the middle of the discharge pipe 15 is operated, the asphalt material in the melting pot 20 is discharged to the outside. An injection hose 91 is connected to the downstream end of the discharge pipe 15, and asphalt material discharged from the injection hose 91 is injected into, for example, a joint portion or a crack portion of an asphalt pavement road. Is done.

  The asphalt material injection device 10 has a structure in which a melting pot 20 is mounted on a carriage 11 and can be installed at an arbitrary place. The cart 11 is also equipped with an operation panel 12 for an operator to operate the asphalt material injection device 10. The operation panel 12 is provided with a dial operation unit 13 (see FIG. 2) for adjusting the discharge amount of the asphalt material. In addition, the remote control part (not shown) for turning on / off discharge of asphalt material is provided in the edge part by the side of the discharge of the injection hose 91.

  As shown in FIGS. 5B and 6, the melting pot 20 has a structure in which a hook body 21 is covered from the outside with a cylindrical case 23, and the melting pot 20 is interposed between the hook body 21 and the cylindrical case 23. An annular gap 24 is formed. Moreover, the cover part 22 which obstruct | occludes the upper end opening of the hook main body 21 protrudes outside the hook main body 21, and has covered the annular clearance 24 from upper direction. As shown in FIG. 3, the lid portion 22 is provided with an insertion port 22 </ b> A for introducing asphalt material into the hook body 21 and an opening / closing door 22 </ b> T for opening and closing the insertion port 22 </ b> A. In addition, the asphalt material thrown into the pot main body 21 may be in a molten state or in a solid state.

  A heating device 30 is provided below the hook body 21. The heating device 30 is constituted by, for example, a ring burner, and is superimposed on the central portion of the shuttle main body 21 (see FIG. 6). The cylindrical case 23 extends below the hook body 21 to enclose a space below the hook body 21, and a viewing window 23 </ b> W (see FIG. 2) that allows the heating device 30 to be seen on the side of the cylindrical case 23. Reference) is formed.

  As shown in FIGS. 5 (B) and 6, the melting pot 20 is provided with a plurality of hook exhaust pipes 31 that open through the inside of the hook body 21 and open at the bottom and side portions of the hook body 21. . The bottom opening 31 </ b> A of the internal exhaust pipe 31 is disposed above the heating device 30, and the side opening 31 </ b> B of the internal exhaust pipe 31 communicates with the annular gap 24. Therefore, the heated air heated by the heating device 30 is introduced into the annular gap 24 through the internal exhaust pipe 31. Thereby, in this embodiment, the hook main body 21 of the melting pot 20 can be heated not only from below but also from the inner side and the outer side of the hook main body 21. In the present embodiment, the plurality of hook exhaust pipes 31 are routed so as to avoid a region below the charging port 22A formed in the lid portion 22 (see FIGS. 3 and 6). It is suppressed that the inner exhaust pipe 31 prevents the asphalt material from being charged.

  Now, in the asphalt material injection device 10 of the present embodiment, as shown in FIGS. 3, 4 and 6, an external heating chamber 50 is juxtaposed on the side of the melting pot 20 and extends from the melting pot 20. The discharge pipe 15 is routed so as to be exposed to the outside through the external heating chamber 50. And the gear pump 16 is provided in the part arrange | positioned in the external heating chamber 50 among the discharge piping 15.

  As shown in FIG. 2, the external heating chamber 50 includes a ceiling wall 50 </ b> A connected to the lid portion 22 of the melting pot 20, a bottom wall 50 </ b> B projecting laterally from the cylindrical case 23, and the cylindrical case 23. A pair of fixed side walls 50C and 50C projecting from the ceiling wall 50A and the bottom wall 50B (only one fixed side wall 50C is shown in FIG. 2) and a U-shape in plan view. In addition, a surrounding wall 50D fixed to the pair of fixed side walls 50C and 50C in a detachable manner is provided. When the surrounding wall 50D is removed, the inside of the external heating chamber 50 is exposed. A temperature display 52 for displaying the temperature inside the pot body 21 is attached to the upper part of the external heating chamber 50.

  As shown in FIG. 4, the drive motor 18 that drives the gear pump 16 is arranged below the external heating chamber 50 so that the rotation output shaft (not shown) faces upward. The drive shaft 17 coupled to the rotation output shaft of the drive motor 18 passes through the bottom wall 50B of the external heating chamber 50 and is directly coupled to the gear of the gear pump 16.

  As shown in FIGS. 5A and 6, in this embodiment, a communication opening 25 is formed in the cylindrical case 23 of the melting pot 20 so as to communicate the annular gap 24 and the external heating chamber 50. Thus, the heated air heated by the heating device 30 is introduced into the external heating chamber 50. That is, in the present embodiment, the heating device 30 that heats the hook body 21 is also used for heating the external heating chamber 50. Specifically, the communication opening 25 is disposed so as to overlap the gear pump 16 in the radial direction of the cylindrical case 23, and the gear pump 16 is supported by a support member 35 fixed to the side surface of the shuttle main body 21. The support member 35 includes a base wall 36 to which the gear pump 16 is attached, and communication walls 37 and 37 that are interposed between both side portions of the base wall 36 and the hook body 21. The communication walls 37, 37 penetrate the communication opening 25, and the base wall 36 is disposed in the external heating chamber 50.

  Here, as shown in FIG. 6, the first exhaust pipe 32 in which the side opening 31 </ b> B faces the external heating chamber 50 and is opposed to the communication opening 25 in the above-described plurality of internal exhaust pipes 31. (Corresponding to the “induction exhaust pipe” of the invention of claim 7) , Is provided. The side opening 31 </ b> B of the first exhaust pipe 32 is covered with the base wall 36 of the support member 35.

  The heated air that has flowed through the second exhaust pipe 33 moves in the circumferential direction through the annular gap 24 and is introduced into the external heating chamber 50 through the communication opening 25. On the other hand, the heated air flowing through the first exhaust pipe 32 is introduced upward or downward by the base wall 36 of the support member 35 and then introduced into the external heating chamber 50. Thus, in this embodiment, since the heated air which has flowed through the first exhaust pipe 32 and the second exhaust pipe 33 is suppressed from being directly blown onto the gear pump 16, the temperature of the gear pump 16 may be excessively increased. Thus, the trouble risk of the gear pump 16 is reduced.

  As shown in FIG. 1 and FIG. 7A, an exhaust projection 55 for discharging heated air introduced into the external heating chamber 50 to the outside is provided at the upper portion of the external heating chamber 50. When the heated air is discharged by the exhaust projection 55, new heated air heated by the heating device 30 is easily supplied into the external heating chamber 50, and the heated air in the external heating chamber 50 can be replaced. . Thereby, it becomes possible to suppress the temperature drop of the external heating chamber 50 due to the stay of heated air.

  Specifically, as shown in FIG. 7A, a ceiling opening 51 is formed in the ceiling wall 50 </ b> A of the external heating chamber 50, and the exhaust protrusion 55 is located above the opening edge of the ceiling opening 51. Protruding. The exhaust projection 55 has a cylindrical shape with a bottom at the upper end, and a pair of exhaust ports 55A and 55A that are opposed to each other in a direction orthogonal to the axial direction of the exhaust projection 55 are formed on the outer peripheral wall 56 of the exhaust projection 55. Has been. As described above, in this embodiment, the exhaust ports 55A are provided in pairs so as to face each other in a direction orthogonal to the axial direction of the exhaust projection 55, so that the pair of exhaust ports 55A, 55A is provided. When the outside air passes, the heated air in the external heating chamber 50 is easily drawn into the exhaust port 55A. Specifically, as shown in FIGS. 3 and 7B, the exhaust projection 55 has a rectangular shape in plan view, and the pair of exhaust ports 55 </ b> A and 55 </ b> A are exhaust projections on the outer peripheral wall 56. The long side walls 56 </ b> A and 56 </ b> A extending along the longitudinal direction of 55 are formed at the upper end portions.

  In the present embodiment, as shown in FIGS. 3, 5A and 5B, the melting pot 20 is provided with an annular gap exhaust port 63 for discharging the heated air in the annular gap 24 to the outside. The heated air in the annular gap 24 is replaced. Specifically, outward openings 61 are formed at a plurality of locations in the circumferential direction at the upper end of the cylindrical case 23 of the melting pot 20, and the outward openings 61 are covered from the outside by the hood portion 62. Yes. The hood portion 62 projects outward from the lid portion 22 and extends downward, and a pair of side walls that block the gap between the curved wall 62A and the cylindrical case 23 in the circumferential direction of the cylindrical case 23. 62B and 62B, and the annular clearance exhaust port 63 is formed by the lower end opening of the hood portion 62 (see FIGS. 5A and 5B).

  As described above, in the present embodiment, the exhaust protrusion 55 that discharges the heated air in the external heating chamber 50 is provided on the ceiling of the external heating chamber 50, whereas the heating in the annular gap 24 is performed. Since the annular gap exhaust port 63 for discharging air opens downward, the heated air in the annular gap 24 has a structure that is less likely to be discharged than the heated air in the external heating chamber 50. As a result, the heated air in the annular gap 24 is prevented from being immediately discharged, and as a result, both the hook body 21 and the external heating chamber 50 can be heated by the heated air.

  Specifically, the size of the annular gap exhaust port 63 is smaller than the size of the exhaust port 55A of the exhaust projection 55, and the exhaust air 55A discharges heated air from the annular gap exhaust port 63. It is easy to do. Thereby, the heated air easily flows from the annular gap 24 to the external heating chamber 50. Further, the plurality of annular clearance exhaust ports 63 are provided with two types having different sizes, and the larger annular clearance exhaust port 63 is more likely to discharge heated air than the smaller annular clearance exhaust port 63. Yes. This makes it easier for the heated air to move within the annular gap 24.

  This completes the description of the configuration of the asphalt material injection device 10 of the present embodiment. In the present embodiment, the heating device 30 corresponds to the “first heating means” of the present invention, and the exhaust pipe 31 in the hook (the first exhaust pipe 32 and the second exhaust pipe 33), the annular gap 24, and the communication. The opening 25 constitutes a “heated air guide” according to the present invention. Further, the heating device 30, the shuttle exhaust pipe 31, the annular gap 24, and the communication opening 25 constitute a “second heating means” according to the present invention. The support member 35 corresponds to the “exhaust cover” according to the present invention, and the base wall 36 corresponds to the “blocking wall” according to the present invention.

  Next, the effect of the asphalt material injection device 10 of this embodiment will be described. In the asphalt material injection device 10 of the present embodiment, the discharge pipe 15 for circulating the asphalt material in the melting pot 20 to the outside is exposed to the outside through the external heating chamber 50 arranged in parallel to the side of the melting pot 20. And the gear pump 16 is provided in the part arrange | positioned in the external heating chamber 50 among the discharge piping 15. Thus, in this embodiment, since the gear pump 16 is provided outside the melting pot 20, maintenance of the gear pump 16 can be easily performed. Further, since the external heating chamber 50 in which the gear pump 16 is disposed is heated by the heating device 30, it is possible to prevent the asphalt material in the discharge pipe 15 from being cooled and difficult to flow, and the load on the gear pump 16 is reduced. It becomes possible to reduce. Moreover, in the present embodiment, the heating device 30 directly heats the melting pot 20 and the heated air heated by the heating device 30 is guided to the external heating chamber 50, so that the heating device for heating the melting pot 20 is used. 30 can be used for heating the external heating chamber 50.

  Further, in the present embodiment, the exhaust projection 55 that discharges the heated air in the external heating chamber 50 to the outside is provided, so that the heated air in the external heating chamber 50 can be replaced and the heated air is retained. The temperature drop of the external heating chamber 50 due to is suppressed. Furthermore, since the melting pot 20 is also provided with an annular gap exhaust port 63 for discharging the heated air in the annular gap 24 to the outside, the heated air in the annular gap 24 can be replaced, It becomes possible to make heated air easy to flow. Moreover, since the annular clearance exhaust port 63 is smaller than the exhaust opening 55A of the exhaust projection 55, the heated air in the annular clearance 24 can be easily flowed to the external heating chamber 50.

  In the present embodiment, the side opening 31 </ b> B of the first exhaust pipe 32 among the plurality of in-pile exhaust pipes 31 for introducing the heated air into the annular gap 24 is covered by the base wall 36 of the support member 35. Since the heated air flowing through the pipe 32 is deflected to the side by the base wall 36 and then introduced into the external heating chamber 50, it is suppressed that the heated air is directly blown onto the gear pump 16, resulting in an excessive temperature rise. The trouble risk of the gear pump 16 can be reduced.

  Furthermore, in this embodiment, since the drive shaft 17 directly connected to the rotation output shaft of the drive motor 18 is directly connected to the gear pump 16, the mechanism for transmitting power from the drive motor 18 to the gear pump 16 can be simplified. Maintenance is improved.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. As shown in the figure, the present embodiment is a modification of the first embodiment, and only the configuration of the first exhaust pipe is different. Specifically, in the present embodiment, the side opening 31 </ b> B of the first exhaust pipe 32 </ b> V is disposed below the communication opening 25. The side opening 31 </ b> B of the first exhaust pipe 32 </ b> V is covered laterally by the cylindrical case 23. In the present embodiment, the first exhaust pipe 32V corresponds to the “induction exhaust pipe” according to the eighth aspect of the present invention.

  In the present embodiment, since the side opening 31B of the first exhaust pipe 32V is shifted downward with respect to the communication opening 25 as viewed from the gear pump 16 side, the heated air that has passed through the first exhaust pipe 32V. Can be prevented from being directly sprayed onto the gear pump 16, and troubles of the gear pump 16 due to excessive temperature rise can be reduced. Further, since the side opening 31B of the first exhaust pipe 32V is covered with the cylindrical case 23, the heated air that has passed through the first exhaust pipe 32V passes along the cylindrical case 23 to the communication opening 25. It is possible to guide, and the temperature of the gear pump 16 can be prevented from becoming too low.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above embodiment, the main body 21 and the external heating chamber 50 of the melting pot 20 are heated by the same heating device (heating device 30), but are heated by separate heating devices. It may be a configuration. In this case, the heating device is not limited to the burner as in the above embodiment, but may be a hot water type such as an oil bath.

(2) In the above-described embodiment, the hook exhaust pipe 31 may be configured by only the first exhaust pipe 32 or may be configured by only the plurality of second exhaust pipes 33. Here, although not belonging to the technical scope of the present invention, when only the first exhaust pipe 32 is provided, the melting pot 20 may not include the annular gap 24. In addition, according to the structure of the said embodiment, the external heating chamber 50 is heated with the heating air which flows through the 1st exhaust pipe 32, and the hook main body 21 is heated with the heating air which flows through the several 2nd exhaust pipe 33. Thus, it becomes possible to distribute the heating object of heating air.

  (3) The exhaust projection 55 may have a configuration having only one exhaust port 55A, or may have a cylindrical shape with an open upper end. In the latter case, the upper end opening of the cylinder forms the exhaust port 55A. In addition, according to the structure of the said embodiment, external air becomes difficult to enter into the exhaust protrusion 55, and the external heating chamber 50 becomes difficult to cool.

  (4) In the above embodiment, the annular clearance outlet 63 is configured to open downward, but may be configured to open laterally. Specifically, in the above-described embodiment, the annular clearance exhaust port 63 may be formed by the outward opening 61 as a configuration without the hood portion 62 (see FIG. 9A).

  (5) The annular clearance exhaust port 63 may be configured as shown in FIGS. 9B and 9C. That is, the lid portion 22 of the melting pot 20 is provided with an opening 66 communicating with the annular gap 24 and a box-like protrusion 67 that covers the opening 66 from above, and the box-like protrusion 67 has an annular gap exhaust. It is good also as a structure in which the opening | mouth 63 was formed. In the example of FIG. 9B, the annular clearance exhaust port 63 is formed on the side wall of the box-shaped protrusion 67. In the example of FIG. 9C, the box-shaped protrusion 67 protrudes outward from the outer edge of the lid part 22, and an annular clearance exhaust port 63 is formed on the lower surface of the protrusion.

  (6) In the first embodiment, the base wall 36 of the support member 35 may be disposed at a position that does not cover the side opening 31 </ b> B of the first exhaust pipe 32. Even with such a configuration, for example, when the distance between the side opening 31B of the first exhaust pipe 31 and the gear pump 16 is wide or the temperature of the heated air is low, the temperature rise of the gear pump 16 is a problem. It will not become.

  (7) In the second embodiment, the side opening 31 </ b> B of the first exhaust pipe 32 </ b> V may be disposed on the side of the communication opening 25. Even with such a configuration, it is possible to achieve the same effects as those of the second embodiment.

DESCRIPTION OF SYMBOLS 10 Asphalt material injection apparatus 15 Discharge piping 16 Gear pump 20 Melting pot 21 Pot main body 23 Cylindrical case 24 Annular clearance (2nd heating means)
25 Communication opening (second heating means)
30 Heating device (first heating means, second heating means)
31 Pot exhaust pipe (second heating means)
32,32V first exhaust pipe (induction exhaust pipe)
35 Support member (exhaust cover)
36 Base wall (barrier wall)
50 External heating chamber 55 Exhaust protrusion 63 Annular clearance exhaust port

Claims (7)

A melting kettle containing asphalt material;
First heating means for heating the melting pot;
A discharge pipe for circulating the asphalt material in the melting pot to the outside;
An asphalt material injection device having a gear pump provided in the discharge pipe,
An external heating chamber arranged side by side of the melting pot;
A second heating means for heating the external heating chamber,
The discharge pipe is routed so as to be exposed to the outside from the melting pot through the external heating chamber,
The gear pump is disposed in the external heating chamber ,
A heating device disposed below the melting pot to heat the melting pot;
A heated air guide for guiding the heated air heated by the heating device into the external heating chamber;
The first heating means is constituted by the heating device,
The second heating means is constituted by the heating device and the heated air guide part,
The melting pot includes a hook main body, a cylindrical case that covers the hook main body from the side and forms an annular gap between the hook main body, and a lid that closes an upper portion of the hook main body and the cylindrical case. And a plurality of hook exhaust pipes opened at the bottom and sides of the hook body through the inside of the hook body,
The cylindrical case is formed with a communication opening for communicating the annular gap with the external heating chamber,
The heated air guide part is an asphalt material injection device including the exhaust pipe in the hook, the annular gap, and the communication opening . The asphalt material injection device according to claim 1, further comprising an exhaust projection that protrudes upward from a ceiling portion of the external heating chamber and includes an exhaust port that discharges the heated air in the external heating chamber to the outside . The exhaust projection has a cylindrical shape with a bottom at the top,
The asphalt material injection device according to claim 2, wherein the exhaust ports of the exhaust protrusion are arranged in pairs so as to face each other in a direction orthogonal to the axial direction of the exhaust protrusion . The front Symbol dissolving tank, the annular gap outlet for discharging the heated air in the annular gap to the outside is provided,
The asphalt material injection device according to claim 2 or 3, wherein the annular clearance exhaust port is open downward . The plurality of hook exhaust pipes include induction exhaust pipes whose side openings opened at the side parts of the hook main body are opposed to the communication opening parts,
An exhaust cover that includes a blocking wall that blocks between the side opening of the induction exhaust pipe and the gear pump, and that deflects the flow of the heated air exhausted from the induction exhaust pipe along the blocking wall. The asphalt material injection device according to any one of claims 1 to 4 . The plurality of hook exhaust pipes include induction exhaust pipes whose side openings opened at the side of the hook body face the external heating chamber side,
The gear pump is disposed so as to face the communication opening,
The side opening of the induction exhaust pipe is disposed at a position shifted to the side or the lower side of the communication opening as viewed from the gear pump side, and is covered with the cylindrical case. The asphalt material injection device according to any one of claims . A drive motor;
  A drive shaft directly connected to the rotation output shaft of the drive motor,
  The asphalt material injection device according to any one of claims 1 to 6, wherein a gear of the gear pump is directly connected to the drive shaft.

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